Probability
 The probability of drawing a red card from a deck of playing cards is

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Total number of cards n(S) = 52
Number of red cards n(E) = 26
∴ P(E) = n(E)/n(S)Correct Option: D
Total number of cards n(S) = 52
Number of red cards n(E) = 26
∴ P(E) = n(E)/n(S) = 26/52 = 1/2
 Find the probability that a vowel selected at random from the 5 vowels is an 'i'. ?

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Here, n(5) = {a, e, i,o, u}
and E = Event of selecting the vowel i = {i}Correct Option: C
Here, n(5) = {a, e, i,o, u}
and E = Event of selecting the vowel i = {i}
∴ P(E)= n(E)/n(S) = 1/5
 If the probability that A will live 15 yr is 7/8 and that B will live 15 yr is 9/10, then what is the probability that both will live after 15 yr ?

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Required probability = P(A) x P(B)
Correct Option: B
Required probability = P(A) x P(B)
= (7/8) x (9/10)
= 63/80
 A single letter is selected at random from the word 'PROBABILITY' . The probability that it is a vowel, is ?

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Total number of letters = n(S) = 11
whereas, number of vowels = n(E) = 4
∴ Required probability = n(E)/n(s)Correct Option: B
Total number of letters = n(S) = 11
whereas, number of vowels = n(E) = 4
∴ Required probability = n(E)/n(s) = 4/11
 A card is drawn from a well shuffled pack of cards. The probability of getting a queen of club or king of heart is ?

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Total ways = 52
There is one queen of club and one king of heart favourable ways = 1 + 1 = 2.Correct Option: B
Total ways = 52
There is one queen of club and one king of heart favourable ways = 1 + 1 = 2.
∴ Required probability = 2/52 = 1/26