Question

सोनालीला वाचताना पाहून नवल वाटणारे घरातील सदस्य,​

Answer 1

Explanation:

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IN AN AP

LET a BE THE 1ST TERM

d BE THE COMMON DIFFERENCE

AND

n BE THE NO. OF TERMS

THEN SUM OF N TERMS (Sn)=n/2[2a+(n-1)d]

IN A GP

LET a BE THE 1ST TERM

r BE THE CONSTANT RATIO

AND

n BE THE NO. OF TERMS

THEN SUM OF N TERMS (Sn)=

$a \dfrac{( {r}^{n} - 1) }{(r - 1)}$

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