if 1²+2²+3²+4²+...x² =x(x+1)(2x+x)/6 then 1²+2²+3²+4²+…19² is equal to what
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19(19+1)(2*19+19)/6
=19(20)(38+19)/6
=19(20)(57)/6
=21660/6
=3610.
=19(20)(38+19)/6
=19(20)(57)/6
=21660/6
=3610.
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