1. Tardigrade
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  4. Let P n denotes the number of ways in which three people can be selected out of ' n ' people sitting in a row, if no two of them are consecutive. If P n +1- P n =15 then the value of ' n ' is -

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Q. Let $P _{ n }$ denotes the number of ways in which three people can be selected out of ' $n$ ' people sitting in a row, if no two of them are consecutive. If $P _{ n +1}- P _{ n }=15$ then the value of ' $n$ ' is -

Permutations and Combinations

Solution:

Correct answer is (b) 8