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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(1+25)times25 then divided in half.13 times 25=325
The sum of all integers between 1 and 25 is equal to (25 x (25 - 1))/2 = 325.
The sum of 1 through 250 is 31,375.
There is a formula to calculate this sum. It is, S = ½n(n + 1) In this question, n = 25 so the sum of the numbers from 1-25 is, ½ x 25 x 26 = 325
-- The sum of 25 and any positive number. -- The difference of 25 and any negative number. -- The product of 25 and any positive number greater than '1'. -- The ratio of 25 to any positive number less than '1'. -- 25 raised to any positive power greater than '1'. -- 25 raised to any negative power less than '1'. -- The factorial of any number greater than 5.