The coefficient of x in the expansion of (x + 5)3 is
We have,
(x + 5)3 = x3 + (5)3 + 3 × x × 5 (x + 5)
= x3 + 125 + 15x (x + 5)
= x3 + 125 + 15x2 + 75x
∴ Coefficient of x = 75
Hence, option D is correct