Question

Given that for any positive integer n, the sum, S(n), of the first n positive integers can be evaluated using the formula S(n) = n(n+1)/2, what is the sum of all integers,n, such that 50 13 years ago

Answer 1

hint :

sum of all integers,n, such that 50<n<100
=sum of first 99 positive integers-sum of first 50 positive integers

Answer 2

why it is the sum of the 50, but not 51?

Answer 3

u have a formula for that in ur question S(n) = n(n+1)/2

Answer 4

because your n starts from 51 so u need to subtract 1st 50 terms and not 51