CBSE Class 10 Math 2023 All India Set-1 Solved Paper

Question : 34 of 38

Marks: +1, -0

(A) The ratio of the

11^{\;\text "th "\;}

term to the

18^{\;\text "th "\;}

term of an A.P. is

2: 3

. Find the ratio of the

5^{\;\text "th "\;}

term to the

21^{\;\text "st "\;}

term. Also, find the ratio of the sum of first 5 terms to the sum of first 21 terms.
OR
(B) If the sum of first 6 terms of an A.P. is 36 and that of the first 16 terms is 256 , find the sum of first 10 terms.

Solution:

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