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How many strings of length 10 over the alphabet {a, b, c, d} have exactly 3 a's? O () O 47 O () - 37 O ()- 47

How many strings of length 10 over the alphabet {a, b, c, d} have exactly 3 a's? O () O 47 O () - 37 O ()- 47

Advanced Engineering Mathematics
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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How many strings of length 10 over the alphabet {a, b, c, d} have exactly 3 a's? O (9) O 47 O () - 37 O () - 47
Transcribed Image Text:How many strings of length 10 over the alphabet {a, b, c, d} have exactly 3 a's? O (9) O 47 O () - 37 O () - 47
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