Given a positive integer n, how many decimal strings of length n begin or end with an even digit? (assume inclusive or).O (10)" - 5² (10)^-2O 5(10) "¹+5(10)"-1O 5(10)-1 +5(10)"-¹-5(10)-2O 5(10)-1 +5(10)-¹-5(2)(10)-²O None of these.

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Answered: Given a positive integer n, how many…

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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Given a positive integer n, how many decimal strings of length n begin or end with an even digit? (assume inclusive or). O (10)" - 5² (10)-2 O 5(10)-1+5(10)"-1 O 5(10)-1 +5(10)"-1 -5(10)-2 O 5(10)-1 +5(10)-¹ — 5(2)(10)¹-2 O None of these.