how many two digits no. are divisible by 3
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12, 15 ........................99
a = 12
d = 15-12
= 3
a(n) = a + (n-1) d
99 = 12 + (n-1) 3
99-12 = (n-1) 3
87 ÷3 = (n-1)
29 = n-1
29+ 1 = n
30 = n
there are 30 two digits number which r divisible by 3
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