Question

A purse contains 10 notes of ₹ 2000, 15 notes of ₹ 500, and 25 notes of ₹ 200. One note is drawn at random. What is the probability that the note is either a ₹ 500 note or ₹ 200 note?

पर्याय

• `1/5`

• `3/10`

• `2/3`

• `4/5`

Answer 1

`4/5`

Explanation;

Hint:

Sample space (S) = 10 + 15 + 25 = 50

n(S) = 50

Let A be the event of getting ₹ 500 note

n(A) = 15

P(A) = `("n"("A"))/("n"("S")) = 15/50`

Let B be the event of getting ₹ 200 note

n(B) = 25

P(B) = `("n"("B"))/("n"("S")) = 25/50`

Probability of the note is either a ₹ 500 note or ₹ 200 note

P(A) + P(B) = `15/50 + 25/50`

= `40/50`

= `4/5`