find the sum of all two digit
Positive integers which are
disivible by 3 but not by 2
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Answer:
A.P=3,9,15..............99
a=3; d=6
an=99
an=a+(n-1)d
99=3+(n-1)6
6(n-1)=99-3
6(n-1)=96
(n-1)=96/6
(n-1)=16
n=16+1
n=17
Sn=n/2[a+an]
Sn=17/2[3+99]
Sn=17/2[102]
Sn=17×51
Sn=867
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