) How many ways are there of arranging 5 letters from this word, if the order does matter?
9C5*5! Or 9P5
2) What is the probability of choosing 5 letters in any order, if the five letters must include A, E and I?
3 letters are already
So one needs to select 2 from rest 6
So 6C2
Total=9C5
Probability=6C2/9C5
Posted from my mobile device
9C5*5! Or 9P5
2) What is the probability of choosing 5 letters in any order, if the five letters must include A, E and I?
3 letters are already
So one needs to select 2 from rest 6
So 6C2
Total=9C5
Probability=6C2/9C5
Posted from my mobile device
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