Question

Find the number of terms in the each of the following APs: (1) 7, 13, 19, . . . ., 205 (2) 18, 15 1/2, 13, . . . . , -47​

Answer 1

Answer:

n = 34

Step-by-step explanation:

1) a = 7

d = 13 - 7 = 6

last term = 205

Using general AP formula

añ = a + (n - 1)d

205 = 7 + (n - 1)6

205 = 7 + 6n - 6

205 = 1 + 6n

204 = 6n

n = 204/6

n = 34