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  4. Let X= 1,2,3,4,5,6,7,8,9 . then total number of subsets of X having atleast one and atmost eight elements is

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Q. Let $X=\{1,2,3,4,5,6,7,8,9\}$. then total number of subsets of $X$ having atleast one and atmost eight elements is

Sets

Solution:

Subsets $=2^9-1-1=510$