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If 4 whole numbers are taken at random and multiplied together. What is the probability that last digit in the number is 1,3,7,9? Please give the explanatjon steps.

If 4 whole numbers are taken at random and multiplied together. What is the probability that last digit in the number is 1,3,7,9? Please give the explanatjon steps.

Grade:12

2 Answers

SAGAR SINGH - IIT DELHI
879 Points
10 years ago

Dear student,

Required probabilty is 1/4.

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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

Sarvesh Raj
20 Points
8 years ago

I think what you are saying may be wrong. I reason out as follows:

See since we are multiplying 4 whole numbers, the numbers of ways in which any of the numbers (0, 1...9) can come in the end(units place) is 4. So according to me the total number of ways should be 104.

And hence 1,3,7,9 can come in units place in 44 ways so the answer should be:

44/10= (2/5)4

Please correct me if i''m wrong and plz tell me why.

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