Question 995055
{{{1+2+3}}}+...+{{{50=1275}}}, we can find the sum of these {{{50}}} numbers if we multiply half of the sum of first and last number by {{{50}}} like this:


{{{((1+50)/2)*50=(51/2)*50=25.5*50=1275}}}

 then {{{51+52+53}}}+...+{{{100}}}= will be

{{{((51+100)/2)*50=(151/2)50=75.5*50=3775}}}

so, answer is: C. {{{3775}}}