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(1+15)*15/2
first plus last times number of numbers then divide by two

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15y ago

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What is the sum of the first 15 prime numbers?

the sum of the first 15 prime numbers is 328 .


What is the sum of the first fifteen odd numbers?

The sum of the first 15 odd numbers is 225.


What is the sum of the first 5 numbers?

The sum of the first 5 numbers is 15. 1+2+3+4+5=15


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