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11 February, 01:29

Find the sum of the summation of 2 i minus 12, from i equals 7 to 16?

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  1. 11 February, 03:53
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    Break up the summand as follows: 2 i minus 12 becomes

    2 (summation of i from 7 to 16) - (summation of 12) (16-7)

    This comes out to 2[ (summation of i from 1 to 16) - (summation of i from 1 to 7) ] - 12 [summation of 1 from 7 to 16]
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