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P is represented as P=xaya+xa1ya1+.....x1y+x0 where 0<x0..xay1. If x and y are positive integers and y=4, then which of the following could be a representation of an integer with y as a base?


Options:
A .   12343
B .   132421
C .   132321
D .   None of these
E .   23
Answer: Option C
:
C

When the base is 4, the maximum digit the number can contain is 3, it cannot contain 4.



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