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If the number of elements in the power s...

If the number of elements in the power set of set A is 128 then find the number of elements in the set A .

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The correct Answer is:
7
Let set A have n elements. Then number of elements in its power set P(A) is `2^n`. According to the question,
`2^n = 128 = 2^7`
`therefore n=7`
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