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Question

 Hwo many two digit numbers are divisible by 6?
 


Solution

The first two digit no. divisible by 6 is 12 and the last two digit no. divisible by 6 is 96
So let a=12 ,d=6, an=96
Now we know that

an=a+(n1)d
96=12+(n-1)6
84=(n-1)6
n-1=14
n=15
hence total no of two digits no. divisible by 6 = 15

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