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Find the number of non-negative integral...

Find the number of non-negative integral solutions of `x_1+x_2+x_3+4x_4=20.`

A

Number of ways of distributing 10 identical objects in four distinct boxes

B

Number of selections of 10 objects from a lot containing four varieties of objects

C

of selections of four objects from a lot containing 10 distinct objects

D

Number of results of a 10-match series between two countries if a match ends either in a win or loss or a draw

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A, B
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