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    ১ থেকে ৪৯ পর্যন্ত সংখ্যাগুলোর যোগফল কত?

A    ১০০০

B    ১২০০

C    ১২২৫

D    ১৫০০

Solution

Correct Answer: Option C

 

S = n*(1 + 49)/2 = 49*(1+49)/2 = 49*50/2 = 1225

 

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