Two function f1(t) and f2(t) with cross correlation of 5

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Two function f₁(t) and f₂(t) with cross correlation of 5 has a average power of 2 and 5 respectively the power of f₁(t) + f₂(t) is—

1. 17
2. 3
3. 12
4. √39

Correct Option: A

Given
P₁ = 2 [Power of function f₁(t)]
P₂ = 5 [Power of function f ₂(t)]
R_{1, 2} (τ) = 5
Now, average power,
P_{1, 2} = P₁ + P₂ + 2R_{1, 2} (τ)
= 2 + 5 + 2 × 5
= 17
Hence, alternative (A) is the correct choice.