Thursday, January 16, 2014

Find the sum: (-2)+0+2+...+76. Show all steps.

a%5Bn%5D=76
d=2
a%5B1%5D=-2
solving the arithmetic equation a%5Bn%5D=a%5B1%5D%2B%28n-1%29d for n yields
%0D%0An=%28a%5Bn%5D-a%5B1%5D%29%2Fd%2B1+=+%2876--2%29%2F2%2B1=40%0D%0A

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