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11 May 2007, 15:02
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1. Using the digit from the set Q = (5, 6, 7, 8, 9), with repetation, how many 3-digit numbers smaller than 600 can be made?
2. Using the digit from the set Q = (5, 6, 7, 8, 9), with no repetation, how many 3-digit numbers smaller than 600 can be made?
2. Using the digit from the set Q = (5, 6, 7, 8, 9), with no repetation, how many 3-digit numbers smaller than 600 can be made?
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Updated on: 12 May 2007, 06:13
Originally posted by [email protected] on 11 May 2007, 18:39.
Last edited by [email protected] on 12 May 2007, 06:13, edited 1 time in total.
Last edited by [email protected] on 12 May 2007, 06:13, edited 1 time in total.
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Three digit numbers (smaller than 600) with repetition:
first digit will be 5. So one possibility.
total numbers = 1*5*5 =25
Three digit numbers (smaller than 600) without repetition:
first digit will be 5. So one possibility.
second digit can't be 5 . so 4 possibilities.
third digit can't be 5 ans can't be same as second digit. so 3 possibilities.
total numbers = 1*4*3 = 12
first digit will be 5. So one possibility.
total numbers = 1*5*5 =25
Three digit numbers (smaller than 600) without repetition:
first digit will be 5. So one possibility.
second digit can't be 5 . so 4 possibilities.
third digit can't be 5 ans can't be same as second digit. so 3 possibilities.
total numbers = 1*4*3 = 12
11 May 2007, 23:51
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can you please explain why it is multiplication, what about repetition of 6,7,8,9 like 566,577,588,599.
I am confused
I am confused
