exam Maths Puzzle Numerical Ability

Will someone please help me with the solution to this problem!
Evaluate P(7,3)
The choices for an answer are as follows:
1. 210
2. 840
3. 35
4. 180
Thank you, Ray!

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if the difference of two numbers is 10 and their product is 18,what is the sum of their squares? how do i do absolute equations