the number of permutations of 8 things taken r at a time .Then r will be____
I asked this question 2 times each time some people don't knew even answer but still they commented...if you know then only give answer.. ans is 4 now please tell correct steps
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Number of permutations of ‘n’ things, taken ‘r’ at a time, when a particular thing is to be always included in each arrangement
= r x P(n-1 r-1)
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