Question

A code signal uses digit-letter-digit combinations but 0 and 1 are not used for either digits or letters.How many code signals are possible? (Given answer is 1536 in book )​

Answer 1

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Since 0 and 1 are not used, total usable digits = 8

Total usable letters = 26

If repetition is allowed, total number of code signals possible = 8x26x8 = 1664

If repetition is NOT allowed, total number of code signals possible = 8x26x7 = 1456

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Answer 2

Step-by-step explanation:

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