How many 2 digit number are divided by 3
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a=12
a2=15
d=3
an=99
an=a+(n-1)d
99=12+(n-1)3
99=12+3n-3
99=9+3n
99-9=3n
90/3=n
n=30
2 digit number are 30
a2=15
d=3
an=99
an=a+(n-1)d
99=12+(n-1)3
99=12+3n-3
99=9+3n
99-9=3n
90/3=n
n=30
2 digit number are 30
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