Q3 of 178 Page 559

The next term of the AP is

Here, first term = √7

Common difference = √28 - √7 = 2√7 - √7 = √7

Next term = T₄ = T₃ + d

= √63 + √7

= 3√7 + √7

= 4√7

= √112

The common difference of the AP is

If 4, x₁, x₂, x₃, 28 are in AP then x₃ = ?

If the nth term of an AP is (2n + 1), then the sum of its first three terms is