how many two -digit no. divisble by 3
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how many two -digit no. divisble by 3
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12,15,18,21......,99
a =12 d=3 sn=99
sn=a+(n-1)d
99=12+(n-1)3
99=12+3n-3
99=9+3n
99-9=3n
90/3=n
n=30
therefore there are 30 2 digit no.divisible by 3
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