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Let A = 1,2,3,4,5 and B = 6,7 . What is the number of onto functions from A to B ?

Options

  1. A10
  2. B20
  3. C30
  4. D32

Correct answer

C. 30

Step-by-step solution

n( ~A )=5 and n( ~B )=2 gathered Number of onto functions =2^5- ^2 C ₁(2-1)^5 =32-2=30 . gathered

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