Question

The blood group of some students of 10th where surveyed and recorded as below.A student chosen at random, find the probability that the student has blood group A or AB.

Answer 1

Total number of students=12+8+5+15=40
No. of students with blood group A or AB =12+5=17
P(E)=No. of favourable outcomes/Total no. of possible outcomes
P(E)=17/40

Answer 2

Since, The formula of Probability= No.of favourable outcomes/ Total no. of possible outcomes

We'll take out the total no of students= 12+8+5+15= 40...........(1)
 And, No. of students with blood group A or AB =12+5=17 (As Required)....(2)

Putting eq. (1) and (2) in the formula, we get
 P(E)=17/40

Therefore, the answer is = 17/40