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1+2 = 3

1+2+3 = 6

1+2+3+4 = 10

1+2+...+ N = 1/2(N+1)N

if N = 50, 1+2+...+50 = 1/2 x 51 x 50 = 1275

Since 2+4+6+...+100 = 2 x (1+2+3+...+50) = 2 x 1275 = 2550

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