How many non-empty subsets of $\{ 1 , 2, 3, 4, 5, 6, 7, 8 \}$ consist entirely of odd numbers?
Question:
How many non-empty subsets of $\{ 1 , 2, 3, 4, 5, 6, 7, 8 \}$ consist entirely of odd numbers?
Answer:
Let's think step by step.

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How many non-empty subsets of $\{ 1 , 2, 3, 4, 5, 6, 7, 8 \}$ consist entirely of odd numbers?
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