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Let ∑ = + 10 1 k ) k a ( f = 16(2 10 – 1), where the function f satisfies f(x + y) = f(x)f(y) for all natural numbers x, y and f

1. = 2. Then the natural number ‘a’ is :
2. 2
3. 3
4. 16 (4) 4

Correct answer: 2

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