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66. The number of functions from an m element set to an n element set is
m + n
mn
nm
m*n
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67. If A is a finite set with n elements, then number of elements in the largest equivalence relation of A is
1
n
n+1
n2
68. The number of equivalence relations of the set (1, 2, 3, 4) is
4
15
16
24
69. If A and B be sets with cardinalities m and n respectively, then number of one-one mappings (injections) from A to B, when m < n, is
nPm
nCm
None of these
70. If A = |x, y|, then power set of A is
{ |x| , |y| }
{φ,|x|.|y|}
{ φ,| x, y | }
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