4. How many solutions does the equationx1 + x₂ + x3 + x4 = 18have, such that x1, x2 and x3 are positive integers and x4 = 3?(a) (¹7)(b) (²) - (¹₂7)(c) 15!(d) (¹44)

Answered: Image /qna-images/answer/5ee1af58-20a1-4e09-ba84-c2ab48677337.jpg

Answered: 4. How many solutions does the equation…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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4. How many solutions does the equation x1 + x2 + x3 + x4 = 18 have, such that x1, x2 and x3 are positive integers and x4 = 3? (a) (¹7) (b) (²) - (¹₂7) (c) 15! (d) (¹4)