Question

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 +14 +15

Answer 1

Answer: 120

If u think about it you start off at an odd number then you add an even then another odd than another even and it keeps repeating... so therefor you have 120...

Answer 2

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To find the sum of the numbers from 1 to 15, you can use the formula for the sum of an arithmetic series:

Sum = (n/2)(first term + last term)

In this case, the first term is 1, and the last term is 15. So we have:

Sum = (15/2)(1 + 15)

= (15/2)(16)

= 120

Therefore, the sum of the numbers from 1 to 15 is 120.