SEQUENCE & SERIES G1

 

The 1st term of an arithmetic progression is 60 and the common difference is 40. Find the nth term

 

solution

 

A1=60, d= 40, n=?

 

An =A1 + (n-1) d

 

An=60 + (n-1)40

 

An=60 + 40n -40

 

An=40n + 60-40

 

An=40n + 20

 

Hence the nth term is An=40n + 20  

 

TRY THIS………………….. 

 

The 1st term of arithmetic progression is 148 and the common difference is 170. Find the nth term