What is the sum of 6square+7square +8square +..............21square
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2
21(22)(43) / 6 - 5(6)(11) / 6
= 7 x 11 x 43 - 55
= 3311 - 55
= 3256
= 7 x 11 x 43 - 55
= 3311 - 55
= 3256
Answered by
0
=36+49+64+81+100+121+144+169+196+225+256+289+324+361+400+441
=3256
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