1. Tardigrade
  2. Question
  3. Mathematics
  4. Let S be the set of permutations of the sequence 1,2,3,4,5 for which the first term is not 1 . A permutation is chosen randomly from S. The probability that the second term is 2 , in lowest terms, is ( a / b ). The value of (a+b) is equal to

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Q. Let $S$ be the set of permutations of the sequence $1,2,3,4,5$ for which the first term is not 1 . A permutation is chosen randomly from $S$. The probability that the second term is 2 , in lowest terms, is $\frac{ a }{ b }$. The value of $(a+b)$ is equal to

Probability

Solution:

Correct answer is (d) 19