SOLUTION: Need to evaluate this and I dont know how 51P2 the two is at the bottom Thank you for help

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Question 879841: Need to evaluate this and I dont know how
51P2
the two is at the bottom
Thank you for help
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
51 P 2 is the same as 51*50

You start at 51. Then you count down until you have 2 numbers to multiply (the 2 is from 51P2). Another example would be 51P4 = 51*50*49*48. Notice how I started at 51 and counted down to 48 to have 4 terms multiplied out.

You could use the formula nPr = (n!)/(n-r)!, but I like the first method better. Either way is up to you.

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So, 51 P 2 = 51*50 = 2550