Question

first term to a PR equal and death ratio of the common difference is 1 is to 2 if seventh term of the first AP and 21st term of II AP 23 and 125 respectively find the two AP​

Answer 1

A(population reference )=2

D(common difference) =1

Let n and m be the no. Of terms in AP first and second respectively.

Given, seventh term of first AP=23

A+(n-1)D=23

2+((n-1)×(1))=23

n-1=21

n=22

First AP series is

2,3,4,5,6...........22,23

And 21st term of Second AP=125

A+(m-1)=125

2+((m-1)×(1))=125

m-1=123

m=124

Second AP series is

2,3,4,5..........,124,125