Explain product rule. How many strings are there of four lowercase let | Discrete Structure 2078

Discrete Structure20785 marksNumerical: Product rule countingProduct rule

Explain product rule. How many strings are there of four lowercase letters that have the letter x in them? [5]

String length: 4 characters - Alphabet: 26 lowercase letters - Condition: the letter 'x' must appear at least once The Product Rule (Multiplication Principle) states: If a procedure consists of a sequence of $k$ tasks, where task 1 can be done in $n1$ ways, task 2 in $n2$ ways, ..., and task

String length: 4 characters - Alphabet: 26 lowercase letters - Condition: the letter 'x' must appear at least once The Product Rule (Multiplication Principle) states: If a procedure consists of a sequence of $k$ tasks, where task 1 can be done in $n1$ ways, task 2 in $n2$ ways, ..., and task