Question

find the sum of all the two digit numbers which are not divisible by 3 or 5

Answer 1

Hi mate !! ☺☺



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The AP is 12,15, 18....,99
first term=12
d=3
an =99
a+(n-1)d=99
12+(n-1)3=99
(n-1)3=87
(n-1)=29
n=30
sum=n/2(a+l)
=30/2(12+99)
=15*111
=1665.

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HOPE IT HELPS !!