a+b = 5 এবং ab = 3 হলে ab এর মান কত?

A 2

B 3

C 4

D 5

Solution

Correct Answer: Option C

 দেওয়া আছে, a+b = 5, ab = 3

আমরা জানি, 4ab = (a + b) 2 – (a – b) 2

= 25-9=16

∴ab = 4

 

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