Question

If the common difference of an AP is 3, then a₂₀ - a₁₅ is ______.

Options

• 5

• 3

• 15

• 20

Answer 1

If the common difference of an AP is 3, then a₂₀ - a₁₅ is 15.

Explanation:-

Common difference, d = 3

a₂₀ - a₁₅ = (a + 19d) - (a+ 14d)

= 5d = 5 × 3 = 15