Question

The 15th term of the A.P. 3, 0, –3, –6, ........ is ______.

Options

• – 42

• 39

• 42

• – 39

Answer 1

The 15th term of the A.P. 3, 0, –3, –6, ........ is – 39.

Explanation:

Here a = first term = 3;

Common difference = d = 0 – 3 = – 3

We know that

T_n = a + (n – 1)d

∴ T₁₅ = a + 14d

= 3 + 14(– 3)

= 3 – 42

= – 39