The value of the expression 1-2-3+4+5-6-7+8+9...+76+77-78-79 is equal to
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Answer:
-80
Step-by-step explanation:
We can divide this into groups of 4, which give us:
(0+1-2-3) + (4+5-6-7).....(76+77-78-79)
Each of these groups gives us the answer -4. There are 20 such groups, hence the answer is (-4)*20 = -80
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