Question

Check whether the following sequence is in A.P.

9, 13, 17, 21, 25, ...

Answer 1

9, 13, 17, 21, 25, ...

t₂ – t₁ = 13 – 9 = 4

t₃ – t₂ = 17 – 13 = 4

t₄ – t₃ = 21 – 17 = 4

t₅ – t₄ = 25 – 21 = 4

Common difference are equal

∴ The sequence is in A.P.