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Let M be a sequence of 9 distinct integers sorted in ascending order. How many distinct pairs of sequences, N and O are there such that i) each are sorted in ascending order, ii) N has 5 and O has 4 elements, and iii) the result of merging N and O gives that sequence?(a) 84(b) 35(c) 194(d) 138The question was posed to me during an online interview.My doubt is from Counting in portion Counting of Discrete Mathematics |
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Answer» Correct answer is (a) 84 |
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