Quant and LRDI queries | CAT 2018 | Breakspace

MBA CAT 2023
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Clearing doubts of CAT 2018 aspirants, by IIMA and IIMC mentors of Breakspace

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Question on Remainder:

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Geometry

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Anil wrote down all the possible three-digit numbers with distinct digits on a blackboard. Of these numbers, Biswas erased all the numbers whose first and last digits were either both even or both odd. How many numbers were left on the board?