“I think of a number and divide it by 5. The answer is 20.”
2 answers:
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Answer:
B. 1/15
Step-by-step explanation:
The number of ways in which we can select x elements from a group of n elements is calculated as:
So, the number of ways in which a computer can select 3 digits is calculated as:
Because there are 10 digits from 0 to 9.
Then, from that 120 options there are 8 that have 3 sequential digits. These options are:
{0,1,2} {1,2,3} {2,3,4} {3,4,5} {4,5,6} {5,6,7} {6,7,8} {7,8,9}
So, the probability that it will choose 3 sequential digits is equal to: