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kiruha [24]
3 years ago
15

How many four-letter codes can be made if no letter can be used twice?

Mathematics
1 answer:
Y_Kistochka [10]3 years ago
8 0

Answer:4 ways to make a code of 4 letters. 6C4=15, 4!=24, and 15×24=360

hope i helped

Step-by-step explanation:

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The sum of 5 consecutive even numbers is 100. What is the first number in this sequence?
gayaneshka [121]

Answer:

16

Step-by-step explanation:

Let's represent this with an equation, where x is the first number. The next number must be x+2, because it has to be even, not x+1, and the rest continue the same way:

x+(x+2)+(x+4)+(x+6)+(x+8) = 100

Solve for x.

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4 0
3 years ago
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8 0
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ss7ja [257]

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Step-by-step explanation:

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3 0
3 years ago
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8 0
3 years ago
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6 0
3 years ago
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