Class 10 Maths · Arithmetic Progressions · NCERT Exercise 5.4 · Question 6

Arithmetic Progressions Medium

The ratio of the

1 1^{t h}

term to the

1 8^{t h}

term of an AP is

2 : 3

. Find the ratio of the

5^{t h}

term to the

2 1^{s t}

term, and also the ratio of the sum of the first five terms to the sum of the first

21

terms.

Answer

a_{5} : a_{21} = 1 : 3

and

S_{5} : S_{21} = 5 : 49

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