A study of effectiveness of the flu vaccine was performed, and some were provided two injections. Results of study are given in the table.
Flu No Flu Total
No Vaccine 7 149 156
One Injection 2 52 54
Two Injections 13 277 290
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Total 22 478 500
The person is chosen at random from sample. Determine probability which person selected (a) had 2 injections, (b) did not get flu, and (c) got flu and had 1 injection.