Question

The common difference of an A.P. in which a₂₀ − a₁₅ = 20, is ______.

Options

• 4

• 5

• 4d

• 5d

Answer 1

The common difference of an A.P. in which a₂₀ − a₁₅ = 20, is 4.

Explanation:

a₂₀ − a₁₅ = 20

a + 19d − a − 14d = 20

5d = 20

d = 4