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taylord4230
14.07.2019 •
Mathematics
How many 7-digit numbers can be formed if the first digit cannot be 0 or 9 and if the last digit is greater than or equal to 7 and less than or equal to 8? repeated digits are allowed?
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Ответ:
1,600,000
(this is one single number and not 3 different numbers)
Explanation:
Imagine having seven slots labeled A, B, C, D, E, F, G
Slot A can have 8 choices {1,2,3,4,5,6,7,8}
Slot B can have 10 choices {0,1,2,3,4,5,6,7,8,9}
Slot C can have 10 choices {0,1,2,3,4,5,6,7,8,9}
Slot D can have 10 choices {0,1,2,3,4,5,6,7,8,9}
Slot E can have 10 choices {0,1,2,3,4,5,6,7,8,9}
Slot F can have 10 choices {0,1,2,3,4,5,6,7,8,9}
Slot G can have 2 choices {7,8}
Multiply out those values: 8*10*10*10*10*10*2 = 1,600,000
In words this value is "one million, six hundred thousand" or we can say it as "1.6 million" as a much shorter more compact format.
Ответ:
B. 50%
Step-by-step explanation:
it's half and half