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18. Find d and n such that dx5y4 is a term of (x + y)n.
19. Find each of the following:
(a)
(b)
(c)
(d)
(e)
(f)
20. Find the sum of the 101 binomial coefficients for n = 100 by assigning specific values to a and b in the identity
21. Find each of the following:
(a)
(b)
22. Find each of the following:
(a)
(b)
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