Ex 15.1

Ex 14.1, 1

Ex 14.1, 2 Important

Ex 14.1, 3

Ex 14.1, 4 (MCQ) Important

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Ex 14.1, 6 Important

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Ex 14.1, 9

Ex 14.1, 10 You are here

Ex 14.1, 11

Ex 14.1, 12 Important

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Ex 14.1, 14 Important

Ex 14.1, 15 Important

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Ex 14.1, 18 Important

Ex 14.1, 19 Important

Ex 14.1, 20* (Optional) Important

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Ex 14.1, 24 Important

Ex 14.1, 25 (i) Important

Ex 14.1, 25 (ii)

Last updated at April 16, 2024 by Teachoo

Ex 14.1, 10 A piggy bank contains hundred 50 p coins, fifty Rs 1 coins, twenty Rs 2 coins and ten 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 will be a 50 p coin? Total number of coins in a piggy bank = 100 + 50 + 20 + 10 = 180 Number of 50 p coins = 100 Probability of getting a 50 p coin = (𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑐𝑜𝑖𝑛𝑠 𝑜𝑓 50𝑝)/(𝑇𝑜𝑡𝑎𝑙 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑐𝑜𝑖𝑛𝑠) = 100/180 = 𝟓/𝟗 Ex 14.1, 10 A piggy bank contains hundred 50 p coins, fifty Rs 1 coins, twenty Rs 2 coins and ten 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 (ii) will not be a ₹ 5 coin? Total number of coins in a piggy bank = 180 Number of ₹ 5 coins = 10 P(not getting a ₹ 5 coin) = 1 – P(getting a ₹ 5 coin) Now, P(getting a ₹ 5 coin) = (𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑐𝑜𝑖𝑛𝑠 𝑜𝑓 ₹ 5 )/(𝑇𝑜𝑡𝑎𝑙 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑐𝑜𝑖𝑛𝑠) = 10/180 = 𝟏/𝟏𝟖 Thus, P(not getting a ₹ 5 coin) = 1 – P(getting a ₹ 5 coin) = 1 – 1/18 = 𝟏𝟕/𝟏𝟖