Question

the blood groups of 30 students of class 9 are recorded as fofollowed :A,B O,O,AB,O,A,O,B,A,O,B,A,O,O,A,AB,O,A,A,O,O,AB,B,A,O,B,A,B,O.

Answer 1

a=9
b=6
o=12
ab=3
I hope it will help u