The number of subsets of 
containing at least one odd number is 
.
Text Solution
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The total number of subsets of given set is 
Even numbers are 
.
Case I: When selecting only one even number.
Number of ways 
Case II : When selecting only two even numbers.
Number of ways 
Case III : When selecting only three even numbers.
Number of ways 
Case IV : When selecting only four even numbers.
Number of ways 
Required number of ways
[Here, we subtract 1 due to the null set]
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