if1+2+3+......+100=5050 and 1+2+3+....+200=20100,then 101+102+103+....+200=
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formula for these equation is
(first no +last no)× total number
(101+200)×100
301×100
30100
(first no +last no)× total number
(101+200)×100
301×100
30100
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