Math, asked by ronit7618, 1 year ago

Sum of the series 6 square+7 square+8 square ...+21 square

Answers

Answered by nagathegenius

3

Answer:

Step-by-step explanation:

lets denote s1=6 square+7 square+8 square ...+21 square

s2=1square+2 square+...+21 square

s3=1square+2 square+...+5 square

s1=s2-s3

=3311-55

=3256

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