a+b= 7, ab= 12 হলে a-b কত?

A +1

B -1

C ক ও খ উভয়েই

D কোনটিই নয়

Solution

Correct Answer: Option C

দেওয়া আছে,
a+b =7
ab= 12

তাহলে, 
a = 4, b = 3 হলে a+b = 7
এবং, ab = 12 হবে।

∴a-b = 4-3 = 1

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