A) \[{{2}^{n-m-1}}-1\]
B) \[{{2}^{n-m-1}}\]
C) \[{{2}^{n-m}}\]
D) none of these
Correct Answer: B
Solution :
total number of subsets = the number of selections of at least two elements including \[m,n\]and natural numbers lying between \[m,\]and \[,n\]=total number of selection from \[n-m-1\]Different things\[{{2}^{n-m-1}}\]
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