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1170 by Sn=n/2(a+l) class 10 ncert
3, 6, 12
Step-by-step explanation: Geometric progression with common ratio 2
5 team of geography series
The sum of the first n terms of a geometric sequence is called geometric series.
To find the sum of a finite geometric series, use the formula, Sn=a1(1−rn)1−r,r≠1 , where n is the number of terms, a1 is the first term and r is the common ratio .
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sum of n terms in geometric series is calculated using
Sₙ = a(rⁿ-1)/(r-1) Where a is the first term & r = common ratio
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