Question 4 Which of the following sentences are not valid? The powerset of X contains 2^10 elements, so X has exactly 56 at most two element subsets. In the binary system there are exactly 64 numbers...

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Extracted text: Question 4 Which of the following sentences are not valid? The powerset of X contains 2^10 elements, so X has exactly 56 at most two element subsets. In the binary system there are exactly 64 numbers six position long. There are exactly 144 numbers which contains 4 different digits (in decimal system) such that the first digit is even. The powerset of X contains 2^10 elements, so X has exactly 20 two element subsets. O O O O