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How many five-digit positive integers exist where the digits are non-increasing from left to right?

For example, 87743 and 10000 fulfill the conditions, but 78987 and 33429 do not.

Answer :

There are 715 five-digit positive integers where the digits are non-increasing from left to right.

Here, we have to find the number of five-digit positive integers where the digits are non-increasing from left to right, you can think of this as selecting five digits (from 0 to 9) with repetition allowed, while ensuring that the selected digits are arranged in a non-increasing order.

This is essentially a combinations with repetition problem.

For each digit, there are 10 choices (0 to 9). Since repetition is allowed, you can use a stars and bars approach, where you place 4 bars among 10 possible positions (one for each digit choice) to separate the digits into groups.

The number of ways to arrange 5 digits with repetition allowed is given by the formula:

Number of arrangements = (n + k - 1) choose k,

where n is the number of digits (10 choices) and k is the number of bars (4). Plugging in the values:

Number of arrangements = (10 + 4 - 1) choose 4 = 13 choose 4 = 715.

So, there are 715 five-digit positive integers where the digits are non-increasing from left to right.

To learn more on combination click:

brainly.com/question/10699405

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