Calculate the number of distinguishable strings that can be formed with the stated letters.3 c's and 5 d's

A. 8
B. 15
C. 336
D. 56


Answer: D

Mathematics

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A. x ? 3 B. x = 0, x ? 3 C. x ? 0, x ? 3 D. 0 ? x ? 3

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A. x =  or - 
B. x =  or - 
C. x = 
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