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Alan has forgotten his 4-digit PIN code. He knows the first digit is 9 and the last digit is larger than 5. How many different sets of 4 digits could it be?
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1 vote
Alan has forgotten his 4-digit PIN code.

He knows the first digit is 9 and the last digit is larger than 5.
How many different sets of 4 digits could it be?

User NeXau
by
7.5k points

1 Answer

6 votes

Answer:

  • 400 sets

Explanation:

  • First digit- 1 option (9)
  • Second digit - 10 options (0 to 9)
  • Third digit - 10 options (9 to 9)
  • Fourth digit - 4 options (6, 7, 8, 9)

Possible number of sets:

  • 1*10*10*4 = 400
User Peter Ambruzs
by
7.3k points
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