Darknight5 wrote:
smkashyap wrote:
I think this is a high-quality question and the explanation isn't clear enough, please elaborate. The solution to DS question is clear.
But was the probability calculated?
Considering that 10 computers were scanned and separated from the lot each day, wouldn't the probability be:
235/250 * 225/240* 215/230 *205/ 220 *195/ 210??
Hello Bunuel,
Even I have a similar doubt. Please clarify
If you want to calculate using this method, then it should fo in this way:
1st day: after removing 15 infected computers: 235/250 * 234/249 * 233/248 ..... * 226/241
2nd day: after removing 15 infected computers: 235/250 * 234/249 * 233/248 ..... * 226/241
3rd day: after removing 15 infected computers: 235/250 * 234/249 * 233/248 ..... * 226/241
4th day: after removing 15 infected computers: 235/250 * 234/249 * 233/248 ..... * 226/241
5th day: after removing 15 infected computers: 235/250 * 234/249 * 233/248 ..... * 226/241
So Probability = (235/250 * 234/249 * 233/248 ..... * 226/241) ^ 5
This is equal to the combination result. That is shown by Bunuel. I hope it helps.