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Cards (3)
No.
of
selection
of
r
things
out
of
n "identical" things is
1
No. of permutation of n different things taken r times is n^r
Example:
In how many ways 4 rings can be worn in three fingers:
3^4
Total number of selections out of n different things:
2^n
All selections except selection of zero selection:
2^n - 1
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