Question

Prove that 20th term of the sequence 4,9,14,19....0

Answer 1

let the (n) term = 20th
and, common difference (d) =5
first term (a) = 4.
n = a + (n-1) * d.
n = 4 + (20 - 1 ) * 5
n = 4 + 19 * 5
n = 4 + 95
n = 99..... answer //////