Question

Find d if t₉ = 23 व a = 7

Answer 1

t₉ = 23    ......[Given]

∴ 7 + (9 – 1)d = 23    ......[t_n = a + (n – 1)d]

∴ 7 + 8d = 23

∴ 8d = 16

∴ d = `16/8`

= 2