Question 996777
Let total humans = 50x
No. of human having type B = (1/10)*50x = 5x
No. of human having type O = (23/50)*50x = 23x
So,
No. of human having type A or AB = 50x -5x -23x 
 = 22x
So probability that someone has blood type A or AB = 22x/50x
= 11/25