Question

find the no. of terms in the series 5+8+11+14+........ if the last term is 95

Answer 1

Ans. a = 5

d = 3

an = 95

We know that,

an = a + ( n - 1 ) d

95 = 5 + ( n - 1 ) 3

95 - 5 = ( n - 1 ) 3

90 ÷ 3 = ( n - 1)

30 = n - 1

n = 30 + 1

n = 31