What is the number of distinct terms in the expansion of (p+q+r+s)10?

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What is the number of distinct terms in the expansion of

(p + q + r + s)^{10}

?

Answer: Option D
:
D
option (d)
The number of distinct terms = arrangement of 10 zeroes and 3 ones =

^{13} C_{3} = 286

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