Question

The n^th term of an A.P. is (7 – 4n), then what is its common difference?

Answer 1

Given, n^th term of A.P.,

a_n = 7 – 4n

Put n = 1,

Then a₁ = 7 – 4

= 3

Put n = 2,

Then a₂ = 7 – 8

= –1

∴ Common difference

= a₂ – a₁

= –1 – 3

= – 4