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[" 14) What is the total number of combi...

[" 14) What is the total number of combinations of "n" different "],[" things taken "1,2,3,...,n" at a time? "[NDA(1)2011]],[[" (a) "2^(n+1)," (b) "2^(2n+1)],[" (c) "2^(n-1)," (d) "2^(n)-1]]

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