5 pens are to be distributed among 4 children randomly. The probabilty that each child get altleast one pen is ??
@FoolForMath there are two formulas, which are:
\[(k-1)C _{n-1} \]
where k->Total no of non-distinguishable objects
n->total no of distinguishable receivers
and
\[(n+k-1)C _{k} \]
Now can you tell me which formula to use in this case and why?

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