Target SBI PO : Aptitude Day 11  :

Probability

1) A bag contains 5 red balls and some blue balls. If probability of drawing a blue ball is double that of a red ball, then number of blue balls in the bag is

(a) 3

(b) 5

(c) 6

(d) 10

(e) None of these

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  (d) 10

2) In how many different ways can five student be seated in three chairs?

(a) 15

(b) 18

(c) 30

(d) 60

(e) None of these

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(d) 60

3) What is the probability that a number selected form the numbers 1, 2, 3, 4,…., 16 is a prime number?

(a) 3/16

(b) 1/4

(c) 3/8

(d) 2/5

(e) None of these

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(c) 3/8                         

4) A card is drawn from a pack of 52 cards. A card is drawn at random. The probability that it is neither a heart nor a king is

(a) 4/13

(b) 9/13

(c) 10/13

(d) 11/13

(e) None of these

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  (b) 9/13

Directions 5-8)  A jar has 6 pencils, each of different color, viz, red, blue, yellow, green black and white.

5) If 5 pencils were removed from the jar, what is the probability that the black one was removed?

(a) 1/30

(b) 1/6

(c) 1/5

(d) 5/(6 )

(e) None of these

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(d) 5/(6 )

6) If two dice are thrown simultaneously, what is the probability that you get a sum of 10 and 11?

(a) 3/35

(b) 5/36

(c) 1/36

(d) 7/36

(e) None of these

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(b) 5/36

7) Out of all integers from 1 to 100, a number is selected at random. Probability that the selected number is not divisible by 7 is

(a)43/50

(b) 7/53

(c) 1/100

(d) none of these

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  (a)43/50   

8) Two coins are tossed together once. The probability of getting at least one head is

(a) 3/4

(b) 1/2

(c) 2/(3 )

(d) none of these

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(a) 3/4             

Directions 9-10) A coin is tossed three times in succession.

9) The probability of obtaining 2 heads is.

(a) 1/8

(b) 2/8

(c) 3/8

(d) 7/8

(e) None of these

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(c) 3/8       

10) In the above questions, what is the probability of getting tail atleast once?

(a) 1/8

(b) 2/8

(c) 3/8

(d) 7/8

(e) None of these

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  (d) 7/8