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ad-work [718]
2 years ago
6

A security alarm requires a four-digit code. The code can use the digits 0–9 and the digits cannot be repeated.

Mathematics
2 answers:
never [62]2 years ago
7 0

Answer:

The answer is <em>C</em>

Explanation: Given:A security alarm requires a four-digit code. The code can use the digits 0–9 and the digits cannot be repeated.  

there is only 2 numbers which are greater than 7 i.e. 8 and 9. ∴ there is 2 possibility for first place.

For the remaining 3 digits there is 9 possibilities (including 1 which would left after choosing 1 from first place )

No of ways for the alarm code beginning with a number greater than 7= 2 P 1 x 9 P 3

<em>Total ways of code with 4 digits= 10 P 4.</em> Hope this helps :)

Oduvanchick [21]2 years ago
7 0

Answer: The answer is C

Step-by-step explanation:

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Ratio for 669 and 221
alexandr402 [8]

Hello from MrBillDoesMath!

Answer:

669/221

Discussion:

Ratio of 669 to 221 =  669/221.

Now,  669 = 3 * 223 and 221  = 13 * 17. Note that all numbers involved in the factorizations are distinct primes so nothing cancels out in their ratio. That is,

669/221 can not be reduced further.


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A. It is an experiment as the sales director is applying treatment ( the training ) to a group and recording the results.

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Answer:

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Step-by-step explanation:

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V - volume of a cylinder

π - pie

r - radius of a cylinder

h - height of a cylinder

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