1.13. Expressing the binomial coefficients in terms of fac- torials and simplifying algebraically, show that n-r+1 Y (a) = n r n () (b) = n (,²-1); (n=¹); n-r (en ("-¹) = + 1) (4₁). (c) (1

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1.13. Expressing the binomial coefficients in terms of fac-
torials and simplifying algebraically, show that
n-r+1
(-²1);
Y
(a) =
n
r
n
()
(b)
n
n-r
(en ("-¹) = + 1)(4₁).
(c)
Transcribed Image Text:1.13. Expressing the binomial coefficients in terms of fac- torials and simplifying algebraically, show that n-r+1 (-²1); Y (a) = n r n () (b) n n-r (en ("-¹) = + 1)(4₁). (c)
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