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If a =16 and b= 5, the value of (a 2+ b 2+ ab) / (a 3 - b 3) is?

1/11
1/19
121/3971
None of these

Correct Answer: 1/11

Explanation:

Given Exp. = (a²+ b²+ ab) / (a³-b³)
= 1 / (a - b)
= 1 / (16 - 5)
= 1/11.

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