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# FIND THE VALUE OF 26 + 28+... +28TH EVEN NUMBER?

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- VamanLv 71 month ago
26 + 28+... +28. Take 26 common. 26(1+2+4+ ...+2*28).

1+2+4+ ...+56+55+.. (reverse order). You will get

57+57+ ... 28 terms. The sum will be 1596, Make it half. 798. To this you add 26*28=728. The sum will be 1526.

- Jeff AaronLv 71 month ago
The 28th even number is 56.

So if you want the sum of all even numbers from 26 to 56, there are 16 of them, so that's (16/2)(2*26 + (16 - 1)*2) = 656

Unless you want the sum of the first 28 terms of 26 + 28 + ..., in which case the sum is (28/2)(2*26 + (28 - 1)*2) = 1484

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