Bangladesh Krishi Bank 2012 (Sr. Officer)) (98 টি প্রশ্ন )
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ব্যাখ্যা (Explanation):
 

Let the number of persons= n

Number of handshakes by first person= n- 1

(As he cannot handshake with himself)

Number of handshakes by second person = n- 2

(As he has already handshaked with first person)

Number of handshakes by third person= n- 3

.

.

Number of handshakes by second last i.e. ( n- 1)th person= n- (n- 1)= 1

Number of handshakes by last i.e. nth person= n- n= 0

So,

Total number of handshakes=(n- 1)+ (n- 2)+ (n- 3)+ 1+ 0

= 0+ 1+ 2+ 3+ ...........(n- 1)

= Sum of first (n- 1) terms

= (n- 1)(n- 1+ 1)/2

= n(n- 1)/ 2

So, Total number of handshakes= n(n- 1)/2

According to question,

n(n- 1)/ 2= 66

=> n^2 - n= 132

=> n^2- n- 132= 0

=> n^2- 12n+ 11n- 132= 0

=> n(n- 12) + 11(n- 12)= 0

=> (n- 12)(n+ 11) = 0

n= 12 or n= - 11(which is not possible as no. Of persons cannot be negat 
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ব্যাখ্যা (Explanation):
 

GDP by sector Services: 53.39%; Agriculture: 15.33% Industry: 31.28% (FY 2015-16)

 
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ব্যাখ্যা (Explanation):
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ব্যাখ্যা (Explanation):
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ব্যাখ্যা (Explanation):
To solve this problem, we can break it down step by step:

1. First, find 80% of 80:
80% of 80 = (80 * 80) / 100 = 64

2. Next, calculate how many questions the person needs to answer correctly to achieve a total of 64 questions. Since they answered 75% of 60 questions correctly, we can calculate the number of correct answers:
(75/100) * 60 = 45 questions answered correctly.

3. Now, calculate the remaining questions they need to answer correctly to reach a total of 64 questions:
64 - 45 = 19 questions

4. Finally, calculate the percentage of questions they need to answer correctly out of the remaining 20 questions to achieve 95%:
(19/20) * 100 = 95%

So, the person needs to answer 19 out of the remaining 20 questions correctly to achieve a total of 64 questions and a 95% success rate.
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ব্যাখ্যা (Explanation):
  1990-1960=30 years if in the first 10 years ,the population was x,then after 30 years it would be =x+2x+3x=7x so, increase=7x/x  X 100%=700%  
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ব্যাখ্যা (Explanation):
 

Total Difference = 32 - (-13) = 45

Average hourly increase = 45/9=5

 
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ব্যাখ্যা (Explanation):
 

American man=3/8 x 2/3 =1/4 of all member All American member=(1- 3/5)=2/5 so American  woman=(2/5-1/4)=3/20

 
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ব্যাখ্যা (Explanation):
 

If we add or subtract a constant to each term in a set the standard deviation will not change.. If we add (or subtract) a constant to each term in a set the mean and the median will increase (decrease) by the value of that constant.

 

এখানে প্রথম ৩০টি প্রশ্নের ব্যাখ্যা দেখতে পারবেন, বাকি সব প্রশ্নের সম্পূর্ণ ব্যাখ্যা পেতে এখনই অ্যাপ ইন্সটল করুন।

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ব্যাখ্যা (Explanation):
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ব্যাখ্যা (Explanation):
 

A= { 2, 3, 5} and B= {1, 3, 5} . Any of the 3 numbers in A could be added to nay of the 3 numbers in B, so 9 sums could be formed. However, there could be some duplication. List the sums systematically; first add 1 to each number in A, then 3, and then 5: 3, 4, 6; 5, 6(x), 10; 7, 8, 10(x). there are 7 different sums

 
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ব্যাখ্যা (Explanation):
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ব্যাখ্যা (Explanation):
 

area of equilateral triangle=√3/4 a2 =√3/4 x(10)2 =25√3

 
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ব্যাখ্যা (Explanation):
 

here, 2x+3x+3x+5x+5x=180 18x=180 x=10 2x=20

 
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ব্যাখ্যা (Explanation):
 

a=4πr2 c=2 πr r=c/2 π now,a=4πr2 =π x ( c/2 π)2 = c2/4π 

 
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ব্যাখ্যা (Explanation):
 suppose, he had  drove x mile each way at time of going, he went  60 mile in 1 hour  he went  1 mile in 1/60 hour he went  x  mile in x/60 hour at time of returning, he went  40 mile in 1 hour 
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ব্যাখ্যা (Explanation):
 y = 5×2 + 3 x2=y-3/5 x=√{(y-3)/5 } 
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ব্যাখ্যা (Explanation):
 

10 patients last for 14 days 1 patients last for 10 x 14 days 35 patients last for 10 x 14/35=4 days  

 
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ব্যাখ্যা (Explanation):
 

The value after 25% increase is tk 125 from tk 100 At 20% decrease, If 100 is the original than the new value is tk 80 if  1     is the original than the  new value is 80/100 If 125 is the original than the new value is tk 80 x125/100 =100 tk

 

এখানে প্রথম ৩০টি প্রশ্নের ব্যাখ্যা দেখতে পারবেন, বাকি সব প্রশ্নের সম্পূর্ণ ব্যাখ্যা পেতে এখনই অ্যাপ ইন্সটল করুন।

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ব্যাখ্যা (Explanation):
 

(7a) (7b) = 7c/7d  7a+b=7c-d a+b=c-d d=c-a-b

 
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ব্যাখ্যা (Explanation):
 max value of y=12 min value if x=-7 greatest possible value=max-min=12-(-7)=19
 
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ব্যাখ্যা (Explanation):
 

let, sum of 6 of them=x=100

The sum of 4 of them=y so,x+y/10=-10 y=100 so average=-200/4=-50

 
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ব্যাখ্যা (Explanation):
 Total student=100 Spanish speaking=100x3/5=60 remaining=100-60=40 German speaking=1/4 x 40=10 so all the other French taking=100-60-10=30 
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ব্যাখ্যা (Explanation):
 

60 miles per hour means, in 60 minutes goes 60 miles In 1 minutes goes 60/60 miles in 20 minutes goes 60 x 20/60 = 20 miles

 
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ব্যাখ্যা (Explanation):
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ব্যাখ্যা (Explanation):
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ব্যাখ্যা (Explanation):
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ব্যাখ্যা (Explanation):
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ব্যাখ্যা (Explanation):

এখানে প্রথম ৩০টি প্রশ্নের ব্যাখ্যা দেখতে পারবেন, বাকি সব প্রশ্নের সম্পূর্ণ ব্যাখ্যা পেতে এখনই অ্যাপ ইন্সটল করুন।

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ব্যাখ্যা (Explanation):
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