Question

find the number of terms in A. P 7,13,19....205​

Answer 1

Answer:

an=a+(n-1)d

205=7+(n-1)6

198=(n-1)6

33=(n-1)

n=34

Answer 2

Solution:

a = 7

d = 13 - 7 = 6

An = 205

Since,

An = a + (n - 1) d

205 + 7 + (n - 1) 6

205 - 7 = (n - 1) 6

198 = (n - 1) 6

198/6 = n - 1

33 = n - 1

33 + 1 = n

n = 34

Therefore, number of terms in the given A.P. = 34.