Question

if the ratio of sun of n terms of two arithmetic progression is 7n+1:4n+27 then find the ratio of their 11th terms

Answer 1

★ ARITHMETIC PROGRESSION ★

Given that :

Sum of two Ap's extensive to nth terms are aslike ,

7n + 1 : 4n + 27

Hence , it's ratio of 11th term extension will be given by ,

7 ( 2n -1 ) + 1 : 4 ( 2n - 1 ) + 27

HERE , n = 11

7 ( 21 ) + 1 : 4 ( 21 ) + 1

147 + 1 : 84 + 27

148 : 111

Hence , 148:111 is the required ratio

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