a. | \[{}^{n+4}{{C}_{n+1}}-{}^{n+3}{{C}_{n}}=15\left( n+2 \right)\] | (p) | 6 |
b. | \[11({}^{n}{{P}_{4}})=20({}^{n-2}{{P}_{4}})\] | (q) | 18 |
c. | \[{}^{2n}{{C}_{3}}=11{}^{n}{{C}_{3}}\] | (r) | 16 |
d. | If p(n,r) = 1680 and C(n,r) = 70 | (s) | 27 |
A) a\[\to \]p, b\[\to \]q, c\[\to \]r, d\[\to \]s
B) a\[\to \]r, b\[\to \]p, c\[\to \]s, d\[\to \]q
C) a\[\to \]s, b\[\to \]c, c\[\to \]q, d\[\to \]p
D) a\[\to \]s, b\[\to \]r, c\[\to \]p, d\[\to \]q
E) None of these
Correct Answer: D
Solution :
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