Question

A subset S of the set of integers 00, 01, ..., 99 is said to have property P if it is impossible
to find two numbers N1 & N2 belonging to set S such that unit digit of N1 and tenth place of N2 is same. Find the maximal numbers of elements in set S with property P.

Plz tell​

Answer 1

Answer:

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Answer 2

Answer:

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