How many 5-digit numbers can be formed from the integers 1, 2, ... , 9 if no digit can appear more than twice?
1 answer:
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Let's make the rule of three: (<span>To calculate the volume of gas spent by the distance traveled)
</span><span>
(volume)_____(Distance)
6 L ----------------- 100 Km
x L ----------------- 3000 Km
</span><span>Directly proportional
</span>
<span>multiply cross
</span>
Let's make the rule of three: (<span>To calculate the amount of gas consumed by the volume in liters consumed).
</span>
(volume)_____(value)
1 L ----------------- $1.20
180 L ------------- $ y
Directly proportional
multiply cross
<span>Now divide the value between the four friends:
</span>
Therefore:
<span>
</span>
</span><span>
(volume)_____(Distance)
6 L ----------------- 100 Km
x L ----------------- 3000 Km
</span><span>Directly proportional
</span>
<span>multiply cross
</span>
Let's make the rule of three: (<span>To calculate the amount of gas consumed by the volume in liters consumed).
</span>
(volume)_____(value)
1 L ----------------- $1.20
180 L ------------- $ y
Directly proportional
multiply cross
<span>Now divide the value between the four friends:
</span>
Therefore:
<span>
</span>