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In a group of 6 people, each person send...

In a group of 6 people, each person sends an email and receives an email amongst themselves. The different number of ways of doing this is N then the last digit of N is (if it is given that no one sends email back to himself)

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NTA MOCK TESTS-NTA TPC JEE MAIN TEST 53-MATHEMATICS
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  18. In a group of 6 people, each person sends an email and receives an ema...

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  19. The weighted means of first 7 natural numbers whose weights are equal ...

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