The number of permutations of the 4 different letters, taken two at a time, is given by:
Ok so then line p is the equation y=x
is that all you needed?
Answer:

Step-by-step explanation:

Answer:
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Step-by-step explanation:
Answer: The correct option is c.
Explanation:
Reason for correct option:

This expression cannot be factored further because
is the complete factor. Therefore the option c is correct.
Reason for incorrect option:

Since the given expression can be factored further therefore the option d is incorrect.

Since the given expression can be factored further. Therefore the option a is incorrect.

Since the given expression can be factored further. Therefore the option b is incorrect.