exam Maths Puzzle Numerical Ability

The Nys had eight grandchildren in 2002. In 2003, they had 12 grandchildren. Find the percent increase in the number of grandchildren from 2002 to 2003.

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The problem is P(n,2)=42, find n. The instructor gave the answer for n, which is 7. I figured out the formula knowing the answer is 7, which is n!/(n-k)!
I need to know the formula to figure out how to get the value of n. Thank you. An aircraft carrier made a trip to Guam and back. The trip there took three hours and the trip back took four hours. It averaged 6 km/h on the return trip. Find the average speed o