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An array that is first 7-sorted, then 5-sorted becomes _________

(a) 7-ordered

(b) 5-ordered

(c) both 2-ordered and 5-ordered

(d) both 7-ordered and 5-ordered

This question was addressed to me in an online quiz.

My question is from Shell sort in division Sorting of Data Structures & Algorithms II

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The correct option is (d) both 7-ordered and 5-ordered

The best explanation: An array that is 7-sorted, becomes 7-ordered. And an array that is 5-sorted, becomes 5-ordered. If k-ordered array is h-sorted, it remains k-ordered. Thus, an array that is first 7-sorted, then 5-sorted becomes both 7-ordered and 5-ordered.

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