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1 + 2 + 3 + ... + 10000 = p
10000 + 9999 + 9998 + ... + 1 = p
_____________________________ +
(1 + 10000) + (2 + 9999) + ... + (10000 + 1) = 2p
10001 x 10000 = 2p
p = 10001 x 5000
= 50005000
Jadi nilai dari 1 + 2 + 3 + ... + 10000 = 50005000