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Katena32 [7]
2 years ago
10

How many different six-digit decimal numbers can be formed where the first digit is a 1 or the last digit is a 5?

Mathematics
1 answer:
Mariulka [41]2 years ago
3 0

Answer:

10000 different numbers

Step-by-step explanation:

The numbers will have the form 1XXXX5, in this case, the order is important because 123465 is a different number to 123645. To know the total of differents decimal numbers, use the formula of permutation with repetition:

n^r

n is the number of options, n=10, and r the number of times you have to place a digit, r=4.

10^4=10000

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