যদি (a - b) = 3 এবং ‍a2 + b2 = 29 হয়, তাহলে ab এর মান কত?

A 20

B 15

C 10

D 25

Solution

Correct Answer: Option C

a2 + b2 = 29 
⇒ (a - b)2 + 2ab = 29 
⇒ 32 + 2ab = 29 
⇒ 2ab = 29 - 9 = 20 
∴ ab = 10

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