Question

a + b = 5 এর a - b = 3 হলে, ab এর মান কত?

Options

1

4

Correct Answer
2

5

Correct Answer
3

3

Correct Answer
4

2

Correct Answer

Explanation

আমরা জানি, $4ab = (a+b)^2 - (a-b)^2 = 5^2 - 3^2 = 25 - 9 = 16$। সুতরাং $ab = 16/4 = 4$।

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