Calculation: 1 × 2 / 1 + 2 × 3 / 1 + 3 × 4 / 1. + 49 × 50 / 1

=1-2 / 1 + 2 / 1-3 / 1 + +1 / 49-1 / 50
=1-1 / 50
=49 out of 50

What's the sum of 1 to 49

=（1+49）*25=1250
Thank you for your adoption

What's one plus 50?

(1 + 50) 50 divided by 2 = 1275

From 1 to 50, what is the sum

1 + 50 = 51, 2 + 49 = 51 ···· 25 + 26 = 51, so 25 * 51 = 1275 I racked my brains

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