Question

If the terms 10, a, 40 are in A.P., then find the value of a.

Options

• 35

• 20

• 25

• 30

Answer 1

25

Explanation:

The terms 10, a, 40 are in A.P.

Then t₂ – t₁ = t₃ – t₂

So, 40 – a = a – 10

⇒ 40 + 10 = a + a

⇒ 2a = 50

⇒ a = 25

Thus, the value of a is 25.