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1+2=3

1+2+3=6

1+2+3+4=10

1+2+3+4+5=15

1+2+3+4+5+6=21

...etc...

1+2+......+24+25=325.

Another approach is:

Sum=(25+1)*25/2=325.

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Q: What is the sum of the number 1 through 25?
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