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Two digits out of 1,2,3,4,5 are chosen at random and multiplied together. What is the probability that the last digit in the product appears as 0 ?

Options

  1. A1 10
  2. B1 5
  3. C2 5
  4. D4 5

Correct answer

B. 1 5

Step-by-step solution

Since two digits are chosen then n ( s )= ^5 C ₂ To get last digit O there are two cases =2 5=10 or 4 5=10 Hence, Probability = 2 ^5 C ₂ = 1 5

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