Combinations & Permutations

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  • #1
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I had mono while this unit was being taught so im havin quite a lot of trouble figurin this homework out. Like this question:

How many 6 digit numbers greater than 800 000 can be made from the digits 1, 1, 5, 5, 5, 8?

I have absolutly no idea so any help would be appriciated! Thanks!
 

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  • #2
xanthym
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Format said:
I had mono while this unit was being taught so im havin quite a lot of trouble figurin this homework out. Like this question:

How many 6 digit numbers greater than 800 000 can be made from the digits 1, 1, 5, 5, 5, 8?

I have absolutly no idea so any help would be appriciated! Thanks!
Because numbers must be greater than (800,000), the first digit must be 8. The number of different arrangements of the remaining 5 digits, consisting of 2-(1)'s and 3-(5)'s is given by:
{Number Arrangements} = (5!)/{(2!)*(3!)} = (10)


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  • #3
87
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ah ok i was tryin something like that, but i didnt realize brackets were necessary. Thankyou!
 

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