The sum of the first 50 positive even integers is 2,550. What is the sum of the even integers from 102 to 200, inclusive?
5,100
7,550
10,100
15,500
20,100
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- > 102 to 200 , total terms are 50 in number - > Since A.P [ (200+102)/2 ] = 151 = Average - > Avg = Sum / n - > Sum = 151 * 50 = 7550 if A、B、C， positive integers，B=（A+C)/2 so Sum (A+B+C)=B*3
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- > 102 to 200 , total terms are 50 in number
- > Since A.P [ (200+102)/2 ] = 151 = Average
- > Avg = Sum / n
- > Sum = 151 * 50 = 7550
if A、B、C， positive integers，B=（A+C)/2
so Sum (A+B+C)=B*3
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