Series Q (1 Viewer)

[hatty]

Find the sum of all integars between 1 and 100 that are not multiples of 6.

killer.

 

[Estel]

Sum of all integers between 1 and 100 is
(n(a+l))/2
=99(100)/2
=4950

Sum of all integers that are multiples of 6
ie 6,12,18... 96
=16(102)/2
=816

Therefore answer is 4950-816
=4134