Question

The common difference of an A.P. in which a₁₅ − a₁₁ = 48, is ______.

Options

• 12

• 16

• −12

• −16

Answer 1

The common difference of an A.P. in which a₁₅ − a₁₁ = 48, is 12.

Explanation:

Given,

a₁₅ − a₁₁ = 48 

⇒ a + 14d − a − 10d = 48

⇒ 4d = 48

⇒ d = 12