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What is 1 - 2 + 3 - 4 + 5 - ... + 99 - 100?


Can you find the value of the alternating addition/subtraction expression above without using a calculator? If so, how do you calculate it?

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rahul0324 profile image82

Best Answer Jessee R (rahul0324) says

4 years ago
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  • rahul0324 profile image

    Jessee R (rahul0324) 4 years ago

    logically we can also see that (-1) will occur 50 times in the series as in

    (1-2)(3-4)(5-6) and so on... so the result will be 50 multiplied by -1 hence -50

sonal shrivastava profile image74

sonal (sonal shrivastava) says

5 weeks ago
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Ben Evans profile image73

Ben Evans says

13 months ago
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Larry Wall says

4 years ago
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working