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Mathematics
Mathematics
Problem
If
∣
A
∣
=
4
|A|=4
∣
A
∣
=
4
and
∣
B
∣
=
7
|B|=7
∣
B
∣
=
7
, how many injective (one-one) functions exist from
A
A
A
to
B
B
B
? a)
35
35
35
b)
840
840
840
c)
2401
2401
2401
d)
210
210
210
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