Question

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

Answer 1

Answer:

There are 26 terms in AP

Step-by-step explanation:

here,

a = 18

d = t2 - t1

d = 15 - 18

d = -3

tn = a + (n-1) d

-47 = 18 + (n-1) ×-3

-47 -18 = (n-1) × -3

-75 = (n-1) × -3

-75/-3 = n-1

25 = n-1

25+1=n

26=n

n=26