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What is the positive difference between the sum of the first 20 positive even integers and the sum of the first 15 positive odd integers?

 
michaelcai  Nov 14, 2017
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S=[F + L] / 2 x N, Where S=Sum, F=First term, L=Last term, N=Number of terms.

S=[2 + 40] / 2 x 20

S =420 - Sum of first 20 even integers.

 

S =[ 1  + 29] / 2 x 15

S =225 - Sum of first 15 odd integers.

 

420 - 225 =195 - The difference

 
Guest Nov 14, 2017

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