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GREYUIT [131]
3 years ago
12

How many strings of 4 decimal digit do not contain the same digit twice?

Mathematics
1 answer:
goblinko [34]3 years ago
7 0
9*9*8*7

You can choose 9 digits for the first digit, 9 Fót the second (because IT can be 0) and 8 Fót the third etc.. hope this helps
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Tammy purchased a prepaid phone card for $15. Long distance calls cost 18 cents a minute using this card. Tammy used her card on
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Answer:

46 minutes

Step-by-step explanation:

Sorry about not answering your question sooner, but here is your answer:

In order to get the answer, we have to subtract the original amount of money on the phone card by the amount left ver after the call:

15 - 6.72 = 8.28

Then, we divide this number by 0.18:

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So, Tammy's call lasted 46 minutes

Hope this helps :)

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