he number of functions f from {1, 2, . . . , 20} onto {1, 2, . . . , 20} such that f(k) is a multiple of 3
whenever k is a multiple of 4 is
(a) 5! · 6! · 9!
(b) 5^6· 15!
(c) 6^5· 14!
(d) 15! · 6!
he number of functions f from {1, 2, . . . , 20} onto {1, 2, . . . , 20} such that f(k) is a multiple of 3
whenever k is a multiple of 4 is
(a) 5! · 6! · 9!
(b) 5^6· 15!
(c) 6^5· 14!
(d) 15! · 6!
whenever k is a multiple of 4 is
(a) 5! · 6! · 9!
(b) 5^6· 15!
(c) 6^5· 14!
(d) 15! · 6!