Question

A piggy bank contains hundred 50p coins, seventy rs 1 coins, fifty rs 2 coins and thirty rs 5 coins. If it is equally likely that one of the coins will fall out when the bank is turned upside down, what is the probability that the coin cbse2013-4m (a) will be a rs. 1 coin? (b) will not be a rs. 5 coin? (c) will be a rs. 50 p or rs.2 coin?

Answer 1

Answer:

(a) total number of coin in piggy bank = 100 + 50 + 20 +10 = 180

number of 50p coins = 100

probability of getting a 50p coin = number of points of 50p / total number of coins.

(b) total number of coin in piggy bank = 180

number of 5 coin ) = 1 - p ( getting of 5 coin )

p ( getting a 5 coin ) = number of getting 5 coins / total number of coin .

P (a) = 10 /180 = 1/18

p ( not getting 5 coin ) = 1 - ( p of getting coins)

1 - 1/18 = 17/18