Question

^{1+2+3+...+99+100=?}

Answer 1

1+2+3+...+99+100

= (1+100)+(2+99)+...

= (101.100):2

=5050

Answer 2

SSH:(100-1):2+1=100

TD:(100+1)x100:2=5050

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Answer 3

1+2+3+...+99+100=[100x(100+1)]:2=100x101:2=10100:2=5050

Answer 4

1+2+3+....+100 = \(\frac{\left(100+1\right)\times100}{2}=5050\)