You answer 12 out of 20 problems correct on your homework. What percent did you answer correct? What percent did you answer inco
2 answers:
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Answer:
a) 0.00001
b) 0.001
Step-by-step explanation:
Given numbers,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
a) If by these numbers we have to make six digit number,
So, the total ways of arranging 6 digit number =
Now, if all six digit in the number are same,
Then the possible ways = 10 ( eg : 000000, 111111, 222222, 333333, 444444... etc ),
Hence, the probability that all six digits are the same
b) The ways that five or more of the digits of the same = exactly 5 digits are same + Exactly 6 digits are same
∵ The ways that 5 digits are same = 10 × 9 = 90 (i.e. 111110, 111112, 111113,.....9 times, 222220, 222221,.....9 times .... etc..)
So, the number of ways that 5 or more than 5 digits are same = 90 + 10 = 100
Hence, the probability that five or more of the digits of the same