A collection in number sequences
By Panos Kalliantasis
Math Puzzle 166
One more exercise in series
Try to solve this math problem and check your answer.
The first 2-digit number is 12
and the last 2-digit number which disible by 3 is 99
It is an A.P difference =3
So 99=12+(n-1)*3
n=30
Correct answer is C. 30
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