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Permutations , combinations and binomial expansion — Statistics STD 11 Commerce — Question

Gujarat BoardEnglish MediumSTD 11 CommerceStatisticsPermutations , combinations and binomial expansion1 Mark
Question
Write the fundamental principle of counting for addition.
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Answer

If there are m distinct things in Group $1$ and $n$ distinct things in Group $2$, then selection of one thing from total things of both groups can be done in $m + n$ ways. This rule is called the fundamental principle of counting for addition.

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