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Comment on MISSISSIPPI Rule

I would like to know, how did you get in the example of the MISSISIPPE (11/1*4*4*2= 34650)
How did you do the multiplication?
greenlight-admin's picture

Let's do some elimination.
First, 11! = (11)(10)(9)...(5)(4)(3)(2)(1) and 4! = (4)(3)(2)(1)
So, we have [(11)(10)(9)...(5)(4)(3)(2)(1)]/[(4)(3)(2)(1)(4)(3)(2)(1)(2)(1)]
Cancel out: [(11)(10)(9)...(5)]/[(4)(3)(2)(1)(2)(1)]
The denominator now equals 48, so rewrite it as...
Cancel out to get: (11)(10)(9)(7)(5)
Evaluate: 34,650

Pls how did you arrive at 20 from the following factorial 5! Divided by 3!1!1!
greenlight-admin's picture

5!/(3!1!1!) = (5)(4)(3)(2)(1)/(3)(2)(1)(1)(1)
= (5)(4)
= 20

5!/(3!1!1!) = (5)(4)(3)(2)(1)/(3)(2)(1)(1)(1)
= 120/6
= 20

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