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Consider the set of vectors that is, the set of vectors with n components, each of which is either 0 or 1 . Let ΩΤ0ld be the subset of Ω consisting of all vectors u= xi . . . Xn] for which ΣǐI Xi įs odd (a) How many vectors are in 12n? How many vectors are in 【2mld? (b) If n is even, let k-n-1; if n is odd let k n. Explain why the sum 71 Tn Tl must be the nunber of vectors in Ω0dd (If this is your answer fron (a), find an alternat representation for the size of Ωο id Conclude by giving an addition-free formula for this sum depending only on n.

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