A carpenter wants to cut a 45 inch board into two pieces such that the longer piece will be 7in longer than the shorter I'll mea
1 answer:
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Answer: 0.0476
Step-by-step explanation:
Given : Two friends and 5 other people compete with each other for first and second chair in an orchestra.
Total people in this competition= 2+5=7
By permutation , Number of ways to arrange 7 people= 7!
Also, number of ways for two friends end up as first and second chair together= 2 × 5! [ 2 ways to arrange friends on first and second chair and 5! ways to arrange others]
I.e. Required probability =
Hence, the probability that the two friends end up as first and second chair together = 0.0476