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3 years ago

Andre makes a three-digit number.

Mathematics

1 answer:

s2008m [1.1K]3 years ago

8 0

Answer: 115,151,115,133,313,331

Step-by-step explanation:

The Andre's number can consist from 1+1+5 or 3+3+1. There are no any other sets of 3 odd digit to get 7.

Lets prove this statement.

Lets 1 of the digit is bigger than 5. However the digit is odd so it can be 7 only. However in this case the residual 2 digits are 0 . This is not possible so the gigits are odd however 0 is even.

Lets check the case when the biggest digit in the set is smaller than 3.

So it can be 1 only.

So the residual 2 digits can be 1 only. The sum of 1+1+1<7 .

SO we've prooven that the only sets of the digits are 1;1;5 or 3;3;1

The set 1;1;5 can give 3 numbers:

115,151,115

The set 1;3;3 can give 3 numbers as well:

133,313,331

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Step-by-step explanation:

Number of people hold by small cars = 4

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Let,

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y = 4x Eqn 1

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Keywords: linear equations, addition

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3 years ago

Six distinct integers are picked from the set {1, 2, 3,…, 10}. How many selections are there, in which the second smallest integ

Ksivusya [100]

Answer:

1680 ways

Step-by-step explanation:

Total number of integers = 10

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Second smallest integer must be 3. This means the smallest integer can be either 1 or 2. So, there are 2 ways to select the smallest integer and only 1 way to select the second smallest integer.

2 ways 1 way

Each of the line represent the digit in the integer.

After selecting the two digits, we have 4 places which can be filled by 7 integers. Number of ways to select 4 digits from 7 will be 7P4 = 840

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3 years ago

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Answer:

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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