There are 10 bags \[{{B}_{1}},{{B}_{2}},{{B}_{3}},...,{{B}_{10}},\]which contain 21, 22? 30 different articles respectively. The total number of ways to bring out 10 articles from a bag is

\[^{31}{{C}_{20}}{{-}^{21}}{{C}_{10}}\]

There are 10 bags \[{{B}_{1}},{{B}_{2}},{{B}_{3}},...,{{B}_{10}},\]whi

1.	There are 10 bags \[{{B}_{1}},{{B}_{2}},{{B}_{3}},...,{{B}_{10}},\]which contain 21, 22? 30 different articles respectively. The total number of ways to bring out 10 articles from a bag is
A.	\[^{31}{{C}_{20}}{{-}^{21}}{{C}_{10}}\]
B.	\[^{31}{{C}_{21}}\]
C.	\[^{31}{{C}_{20}}\]
D.	None of these
Answer» B. \[^{31}{{C}_{21}}\]

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There are 10 bags \[{{B}_{1}},{{B}_{2}},{{B}_{3}},...,{{B}_{10}},\]which contain 21, 22? 30 different articles respectively. The total number of ways to bring out 10 articles from a bag is

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