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Question
Calculate : $$1- 2 + 3 - 4 + 5 - 6 + 7 - 8 +.....+ 49 - 50$$
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Solution
Verified by Toppr
We have: $$1-2+3-4+5-6+7-8+.....+49-50$$
$$\Rightarrow (1-2)+(3-4)+(5-6)+(7-8)+.....+(49-50)$$
$$\Rightarrow (-1)+(-1)+(-1)+(-1)+.....+(-1)$$ ....[$$25$$ times]
$$\Rightarrow -25$$
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Calculate 1 − 2 + 3 − 4 + 5 − 6 + 7 − 8 + ... + 49 − 50.
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