xat discution
Please help me out with the below scenario,
Suppose I have a set of duplicate numbers such as S={1,2,3,1,2,3}
and out of those I have to select 4 numbers such that their rearrangement is not counted.
For e.g in this case for selection 4 numbers
1,2,3,1
1,2,3,2
1,2,3,3
1,1,2,2
2,2,3,3
1,1,3,3
so total 6 cases are possible.
while selecting 5 numbers
1,2,3,1,2
1,2,3,1,3
1,2,3,2,3
only three cases are possible.
Can some please come up with a solution for the question and the set can be of any number with equal number of duplicates in it.
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Hi i have a simple doubt
For the words adroit
How many words can be formed which either begins with T or ends with A,
If the answer is 5! +5! -4!
why r we not substracting 2*4! as we are counting the T at start and A at end twice in both the 5!???