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14) How many strings of length 12 over the alphabet {a, b, c, d} start with "aa" or end with "aa" or both? a. 2.4¹0 +48 b. 2.410 48 - c. 2. (¹22).4¹0 + (12).48 d. 2. (¹2). 4¹0 (12) 48 -

14) How many strings of length 12 over the alphabet {a, b, c, d} start with "aa" or end with "aa" or both? a. 2.4¹0 +48 b. 2.410 48 - c. 2. (¹22).4¹0 + (12).48 d. 2. (¹2). 4¹0 (12) 48 -

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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14) How many strings of length 12 over the alphabet {a, b, c, d} start with "aa" or end with "aa" or both? a. 2.4¹0 + 48 b. 24¹0-48 c. 2 ⋅ (¹²) · 4¹0 + (¹²) · 48 d. 2. (¹2). 4¹0 – (12) 48 ●
Transcribed Image Text:14) How many strings of length 12 over the alphabet {a, b, c, d} start with "aa" or end with "aa" or both? a. 2.4¹0 + 48 b. 24¹0-48 c. 2 ⋅ (¹²) · 4¹0 + (¹²) · 48 d. 2. (¹2). 4¹0 – (12) 48 ●
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