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31. The universal relation A x A on A is
an equivalence relation
anti-symmetric
a partial ordering relation
not symmetric and not anti-symmetric
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32. Total number of different partitions of a set having four elements is
16
8
15
4
33. A partition of {1, 2, 3, 4, 5} is the family
((1, 2),(3, 4),(3, 5))
(φ(1, 2),(3, 4),(5))
{(1, 2, 3),(5)}
{(1, 2,), (3, 4, 5)}
34. The matrices and
commute under the multiplication
if a = b (or) θ = nπ, n is an integer
always
never
if a cos θ ≠ b sin θ
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