CBSE Class 11-science Answered
what is the ans
Asked by hridayjayaram085 | 31 Jan, 2024, 10:53: PM
Expert Answer
Let a is the first term , r is the common ratio and n be the number of terms.
Sum of n number of terms is
if a = 5 and r = 2 , then above expression becomes
5 ( 2n - 1 ) = 315
( 2n - 1 ) = 63
2n = 64 or n = 6
Last term = a r(n-1) = 5 × 25 = 160
Answered by Thiyagarajan K | 02 Feb, 2024, 05:42: AM
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