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Let f(x) = a ax ax 1 a ax 0 1 a 2 − − , a ∈ R. Then the sum of the square of all the values of a, for which 2f ′ (10) – f ′ (5) + 100 = 0, is-

1. 117
2. 106
3. 125
4. 136

Correct answer: 125

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