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( 1 - 2 ) + ( 3 - 4 ) + ( 5 - 6 ) + ... - 100
-1 × 50
= -50
(1 - 2) + (3 - 4) + (5 - 6) + ... + (99 - 100)
= (-1) + (-1) + ... + (-1) --> ada sebanyak 50 suku
maka hasilnya:
(-1) x 50 = - 50