How many 2 digit numbers are divisible by 4
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12,16,20,24.................96
a=12 d=16-12=4
an = a +(n-1)d
96=12+( n-1)4
(n-1)4=96-12
(n-1)4= 84
n-1=84/4
n-1= 21
n= 21+1
n= 22
And hence 22 two digit numbers are divisible by 4
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