Question

Difference between addition of even and odd number between 1 and 60

Answer 1

Addition of even

formula
= n(n+1)/2

there are 30 even numbers in 1 to 60.

= 30(30+1)/2
= 465

total sum of 1 to 60 - sum of even = sum of odd numbers.

sum of 60 numbers

=n(n+1)/2
=60×61/2
= 1830

sum of odd numbers = 1830 - 465 = 1365

So the difference between sum of even and sum of odd is 1365 - 465 = 900.
is it correct