Find the number of ways that the numbers 1, 2, ..., 12 can be arranged in a sequence (a1,a2,...,a12)such that a1 >a2 >a3 >a4 >a5 >a6 and a6

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Q: sequence

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Q: Calculate an for the sequence 2/(12+1) +1/(22+1) +2/(32+1) +1/(42+1) +.

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Q: A license plate consists of   five symbols on each​ plate, where the first two symbols are letters…

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Q: Suppose I choose two numbers from the set {1, 2, 3,… 100}. How many have an even sum? Show all work.

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Q: How many six-digit even numbers more than 200,000 can be formed using all of the digits 1, 1, 2, 2,…

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Q: How many ordered sequences are possible that contain eight objects chosen from eleven?

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Q: How many four-letter sequences are possible that use the letters c, r, h, e once each?

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