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2016 (Football) (Sports and Youth Department)
Question 16 of 100
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100
If (a + b)² = 25 and (a² + b²) = 9, find the value of ab.
A
15
B
8
C
10
D
5
Correct Option:
B
Explanation
Use (a + b)² = a² + b² + 2ab. Given 25 = 9 + 2ab, we get 2ab = 16, so ab = 8.
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