How many two - digit nos are divisible by 3 using A.P.
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2 digit nos divisible by 3 are 12,15.........99
where a= 12 d= 15-12=3 An= 99
an= a+( n-1)d
99=12+ (n-1)×3
(n-1)×3= 99-12=87
n-1=87/3=29
n= 29+1= 30
where a= 12 d= 15-12=3 An= 99
an= a+( n-1)d
99=12+ (n-1)×3
(n-1)×3= 99-12=87
n-1=87/3=29
n= 29+1= 30
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