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  • Question
  • The letters of the word CASTIGATION is arranged in different ways randomly. What is the chance that vowels occupy the even places ?


  • Options
  • A. 0.04
  • B. 0.043
  • C. 0.047
  • D. 0.05

  • Correct Answer
  • 0.043 

    Explanation

     Vowels are A I A I O, 

     

     C    A   S    T   I    G   A    T   I    O   N

     

    (O) (E) (O) (E) (O) (E) (O) (E) (O) (E) (O)

     

    So there are 5 even places in which five vowels can be arranged and in rest of 6 places 6 constants can be arranged as follows :

     

    n ( E ) = 5 P 5 2 ! * 2 ! ( A , I   a r e   2   t i m e s ) * 6 P 6 2 ! ( T   i s   2   t i m e s ) = 21600

     

    n ( S ) = 11 ! 2 ! * 2 ! * 2 ! ( A ,   I   a r e   2   t i m e s ) = 4989600

     

    21600 4989600 = 0 . 043


  • Probability problems


    Search Results


    • 1. The day before yesterday, I was 25 years old, and next year I will turn 28. How is it possible?

    • Options
    • A. 31 Dec
    • B. 30 Dec
    • C. 1 Jan
    • D. 28 Feb
    • Discuss
    • 2. A batsman makes a score of 87 runs in the 17th inning and thus increases his average by 3. Find his average after 17th inning?

    • Options
    • A. 40
    • B. 39
    • C. 50
    • D. 55
    • Discuss
    • 3. The length of a side of an equilateral triangle is 8 cm. The area of the region lying between the circum circle and the incircle of the triangle is (use: ? = 22/7)

    • Options
    • A. 50 1/7 sq.cm
    • B. 50 2/7 sq.cm
    • C. 75 1/7 sq.cm
    • D. 75 2/7 sq.cm
    • Discuss
    • 4. The sum of the length and breadth of a rectangle is 6 cm. A square is constructed such that one of its sides is equal to a diagonal of the rectangle. If the ratio of areas of the square and rectangle is 5 : 2, the area of the square in cm2 is

    • Options
    • A. 20
    • B. 10
    • C. 4?5
    • D. 10?2
    • Discuss
    • 5. From the four corners of a rectangular sheet of dimensions 25 cm x 20 cm, square of side 2 cm is cut off from four corners and a box is made. The volume of the box is

    • Options
    • A. 828 cm3
    • B. 672 cm3
    • C. 500 cm3
    • D. 1000 cm3
    • Discuss
    • 6. In a throw of a coin, find the probability of getting a head.

    • Options
    • A. 1
    • B. 1/2
    • C. 1/4
    • D. 0.1
    • Discuss
    • 7. A box contains 100 balls, numbered from 1 to 100. If three balls are selected at random and with replacement from the box, what is the probability that the sum of the three numbers on the balls selected from the box will be odd?

    • Options
    • A. 1/6
    • B. 1/3
    • C. 1/2
    • D. 1/4
    • Discuss
    • 8. A number is selected at random from the numbers 1 to 30. What is the probability that it is divisible by either 3 or 7 ?

    • Options
    • A. 1/30
    • B. 2/30
    • C. 1/25
    • D. 1/2
    • Discuss
    • 9. A fair coin is tossed 11 times. What is the probability that only the first two tosses will yield heads ?

    • Options
    • A. (1/2)^11
    • B. (9)(1/2)
    • C. (11C2)(1/2)^9
    • D. (1/2)
    • Discuss
    • 10. One card is drawn from a pack of 52 cards, each of the 52 cards being equally likely to be drawn find the probability the card drawn is red.

    • Options
    • A. 2/3
    • B. 1/2
    • C. 1/52
    • D. 13/51
    • Discuss


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