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  3. Total number of injections (one-to-one mappings) that can be defined from a1,a2,a3,a4 to b1,b2,............ b7 is
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Total number of injections (one-to-one mappings) that can be defined from a1,a2,a3,a4 to b1,b2,............ b7 is

Answers (1)
D Deependra Verma

Solution:   Total number of one-one maps

                                              ^7P_4=frac4!(7-4)!=840.

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