Easy
1 point
ID: #27445
Question
a+b = 9,a-b=7 হলে ab = কত?
Options
1
7
Correct Answer
2
6
Correct Answer
3
9
Correct Answer
4
8
Correct Answer
Explanation
আমরা জানি, 4ab = (a+b)² - (a-b)² = 9² - 7² = 81 - 49 = 32. তাহলে ab = 32/4 = 8।
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