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MakcuM [25]
3 years ago
9

Sale price, 40$ discount 25% original price,x

Mathematics
1 answer:
Vsevolod [243]3 years ago
5 0
The discount off is $10, so the price would be 30 dollars
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The coefficient of x^ky^n-k in the expression of (x+y)^n equals (n-k/k) true or false
gulaghasi [49]

Answer:

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Step-by-step explanation:

The given statement is:

The coefficient of x^ky^n-k in the expression of (x+y)^n equals (n-k/k)

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Reason:

When we do expansion of (x+y)^n by binomial theorem we get the following solution:

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This shows that the coefficient of  x^ky^n-k  is nCk which is equivalent to n!/(n-k)! k!

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