Question

Didefinisikan fungsi (n) = 2^n-¹ + 2^n - 2^n+¹ untuk setiap bilangan asli n . Nilai dari f(1) + f(2) + ... + f(5) adalah?

Answer 1

F(1) = 2^0 + 2^1 - 2^2 = -1 f(2) = 2^1 + 2^2 - 2^3 = -2 f(3) = 2^2 + 2^3 - 2^4 = - 4 f(4( = 2^ 3 + 2^4 - 2^ 5 = -8 f(5) = 2^4 + 2^ 5 - 2^ 6 = -16 f(1) + f(2) + f(3)+ f(4) + f(5) = -31