


A medical researcher need to select 6 people out of 13 people who have volunteered for the test in
To find, how many ways can 6 people be selected.
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Just multiply 5:13 by any number
10:26
15:39
20:52
25:65
etc...
Here is the answer:
if you need step by step let me know
6:00-30 minutes is 5:30
5:30-15 minutes is 5:15
5:15-45 minutes is 4:30
She started on 4:30 pm
xy² = x · y · y
xz = x · z
LCM(xy², xz) = x · y · y · z = xy²z