Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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please help with textbook question.

Let i, j, k, l be positive integers, and let n = i +j + k + l. 1. Give a combinatorial proof that (") (¹) (2) = (1) ( " / 9) (~~-~-~^) k
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Transcribed Image Text:Let i, j, k, l be positive integers, and let n = i +j + k + l. 1. Give a combinatorial proof that (") (¹) (2) = (1) ( " / 9) (~~-~-~^) k
Expert Solution
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Step 1: Here we expand the L.H.S with the combination formula .

Advanced Math homework question answer, step 1, image 1

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