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integers

by deagez » Sat Sep 05, 2009 1:06 pm
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?

a)5,100
b)7,550
c)10,100
d)15,500
e)20,100

answer is B

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by chetanojha » Sat Sep 05, 2009 1:23 pm
find below
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avg1.PNG

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by praky_rules » Wed Sep 09, 2009 4:47 pm
102=2+100
104=4+100
.
.
.
200=100+100

Sum both sides =>ans = 2550+50*(100)=7550