Question

find whether 55 is a term of the ap 7,10,13​

Answer 1

Answer:

169

Step-by-step explanation:

a = 7, d = 3, n = 55

an = a + (n - 1)d

= 7 + (54)(3)

= 7 + 162

= 169

Answer 2

Answer:

let 55 is the n th term

here 1st term is 7

common difference is (10-7)=3

so,

7+(n-1).3=55

(n-1).3=55-7=48

n-1=48/3=16

n=16+1=17

so 55 is the 17th term of the ap series