Question

if the number of permutations of 4 letters that can be made out of the word EXPRESSION is equal to lambda then (lambda - 2181) is equal to
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Answer 1

Answer:

Step-by-step explanation:

general expression nPr= n!/(n-r)!

Number of permutations of 4 letters chosen from 10 letters in EXPRESSION = lambda :

= 10P₄ =10!/(10-4)! = 10!/6! =10×9×8×7×6!/6! = 10×9×8×7=5040

So lambda=5040

so lambda - 2181 = 5040-2181 = 2859

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