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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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