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The number of integers x,y,z, w such ...

The number of integers x,y,z, w such that `x +y+z+w=20 and x , y, w,z ge -1` is

A

`""^(21)C_(3)`

B

`""^(25)C_(3)`

C

`""^(26) C_(3)`

D

`""^(27)C_(3)`

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The correct Answer is:
D
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