Can you show out how have found the sum so quickly?

1+2+3+4+....+98+99+100=
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1+2+3+4+....+98+99+100= sum of 100 natural numbers

                                       = n(n+1)/2

                                      = 100(100+1)/2    [ here n= 100]

                                      = (100)(101)/2

                                     = 10100/2

                                     = 5050

by Level 4 User (5.5k points)

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