+220 Adam forgot his 4-digit pin code. He knows it consists of three 5's and one 7. How big of a chance is there that he types the correct code in one try?
+26367 Adam forgot his 4-digit pin code. He knows it consists of three 5's and one 7.
How big of a chance is there that he types the correct code in one try?
\(\begin{array}{|r|c|} \hline \text{code}& \text{chance of correct code} \\ \hline 5557 & 25\ \% \\ \hline 5575 & 25\ \% \\ \hline 5755 & 25\ \% \\ \hline 7555 & 25\ \% \\ \hline \end{array} \)
+67 For these types of questions, I like to use a drawn-out graph. Since there are four possible digits, you should have four rows, each for one digit
and since you have all four out of four digits id draw four rows again, creating a chart. fill that out, and you'll see that there are four possibilities
If you only knew three digits, then you would have to add many more rows. I hope this helps
| 5 | 5 | 7 | 5 |
| 7 | 5 | 5 | 5 |
| 5 | 7 | 5 | 5 |
| 5 | 5 | 5 | 7 |
Sorry the graph was too big
BTW: this is my first answer in the forums!!! Glad to be a part of the community
-DBZ
