Question: Please provide detailed solution with explanation and justification asap to get a upvote b) How many 10-character strings of decimal digits (@91) contain a 5

Please provide detailed solution with explanation and justification asap to get a upvote

b) How many 10-character strings of decimal digits (@91) contain a 5

b) How many 10-character strings of decimal digits (@91) contain a 5 and a 7?

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