Question

the ratio of the 11th term to the 18th term of an AP is 2:3. find the ratio of the 5th term to the 21st term, and also the ratio of the sum of first five terms to the sum of the first 21 terms

Answer 1

i hope this will usful to u

Answer 2

answer:-

Ratio of 5th to 21st term. Of AP =1:3

Ratio of sum of first 5 term to sum of first 21 term =5:49