CBSE Class 10 Maths (Standard) 2023 · Paper 30/6/1 · Question 34(a)

Arithmetic Progressions 5 marks Hard

The ratio of the

1 1^{th}

term to the

1 8^{th}

term of an A.P. is

2 : 3

. Find the ratio of the

5^{th}

term to the

2 1^{st}

term. Also, find the ratio of the sum of first 5 terms to the sum of first 21 terms.

Answer

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

and

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

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