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Home Aptitude Permutation and Combination See What Others Are Saying!
  • Question
  • In the below word how many words are there in which R and W are at the end positions? RAINBOW


  • Options
  • A. 120
  • B. 180
  • C. 210
  • D. 240

  • Correct Answer
  • 240 

    Explanation

    When R and W are the first and last letters of all the words then we can arrange them in 5!ways. Similarly When W and R are the first and last letters of the words then the remaining letters can be arrange in 5! ways.

    Thus the total number of permutations = 2 x 5!  = 2 x 120 = 240


  • More questions

    • 1. 
      The smallest positive prime (say p) such that 2 p - 1is not a prime is

    • Options
    • A. 5
    • B. 11
    • C. 17
    • D. 29
    • Discuss
    • 2. 16, 25, 36, 72, 144, 196, 225

    • Options
    • A. 36
    • B. 72
    • C. 196
    • D. 225
    • Discuss
    • 3. 8, 13, 21, 32, 47, 63, 83

    • Options
    • A. 47
    • B. 63
    • C. 32
    • D. 83
    • Discuss
    • 4. 
      [( 3.242 x 14 ) / 100] =?

    • Options
    • A. 0.045388
    • B. 4.5388
    • C. 453.88
    • D. None of these
    • Discuss
    • 5. From a point P on a level ground, the angle of elevation of the top of a tower is 30°, if the tower is 100 m high, find the distance of point P from the foot of the tower.

    • Options
    • A. 100 m
    • B. 173 m
    • C. 200 m
    • D. 273 m
    • Discuss
    • 6. Ayesha's father was 38 years of age when she was born while her mother was 36 years old when her brother four years younger to her was born. What is the difference between the ages of her parents?

    • Options
    • A. 2 years
    • B. 4 years
    • C. 6 years
    • D. 8 years
    • Discuss
    • 7. A dishonest milkman professes to sell his milk at cost price but he mixes it with water and thereby gains 25%. The percentage of water in the mixture is:

    • Options
    • A. 4%
    • B. 6¼%
    • C. 20%
    • D. 25%
    • Discuss
    • 8. A farmer travelled a distance of 61 km in 9 hours. He travelled partly on foot @ 4 km/hr and partly on bicycle @ 9 km/hr. The distance travelled on foot is:

    • Options
    • A. 14 km
    • B. 15 km
    • C. 16 km
    • D. 17 km
    • Discuss
    • 9. 
      3.2 x 8.1 + 3185 ÷ 4.95 =?

    • Options
    • A. 670
    • B. 660
    • C. 645
    • D. 690
    • Discuss
    • 10. 
      Exp. = (.35 x .0015) / (.25 x .07) written as a percentage is?

    • Options
    • A. 0.3 %
    • B. 3 %
    • C. 30 %
    • D. None of these
    • Discuss


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