sereis prashn....

if Σn=55 , then Σn2=

4 Answers

21
mohit_ sharma ·

ans should be 385

36
rahul ·

n(n + 1) = 110
=> n = 10

thus, Σn2 = (10)(11)(21)/6 = 385

1
Ayush Dube ·

ur question is inappropriate
until we know the limits on sumation sign, we cant coment on the us of formula n(n+1)/2

1
Md. Shahbaz Siddiqi ·

@ ayush i too was confused but the answer is correct

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