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  • Question
  • From a total of six men and four ladies a committee of three is to be formed. If Mrs. X is not willing to join the committee in which Mr. Y is a member, whereas Mr.Y is willing to join the committee only if Mrs Z is included, how many such committee are possible?


  • Options
  • A. 91
  • B. 104
  • C. 109
  • D. 98

  • Correct Answer
  • 91 

    Explanation

    We first count the number of committee in which

    (i). Mr. Y is a member
    (ii). the ones in which he is not

    Case (i): As Mr. Y agrees to be in committee only where Mrs. Z is a member.
    Now we are left with (6-1) men and (4-2) ladies (Mrs. X is not willing to join).

    We can choose 1 more in5+ 2 C 1 =7 ways.

    Case (ii): If Mr. Y is not a member then we left with (6+4-1) people.
    we can select 3 from 9 in 9 C 3 =84 ways.

    Thus, total number of ways is 7+84= 91 ways.


  • Permutation and Combination problems


    Search Results


    • 1. A team of 8 students goes on an excursion, in two cars, of which one can seat 5 and the other only 4. In how many ways can they travel?

    • Options
    • A. 126
    • B. 120
    • C. 146
    • D. 156
    • Discuss
    • 2. How many arrangements can be made out of the letters of the word DRAUGHT, the vowels never beings separated?

    • Options
    • A. 1440
    • B. 720
    • C. 360
    • D. 640
    • Discuss
    • 3. In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?

    • Options
    • A. 209
    • B. 290
    • C. 200
    • D. 208
    • Discuss
    • 4. How many numbers of five digits can be formed by using the digits 1, 0, 2, 3, 5, 6 which are between 50000 and 60000 without repeating the digits?

    • Options
    • A. 120
    • B. 240
    • C. 256
    • D. 360
    • Discuss
    • 5. 36 identical books must be arranged in rows with the same number of books in each row. Each row must contain at least three books and there must be at least three rows. A row is parallel to the front of the room. How many different arrangements are possible ?

    • Options
    • A. 5
    • B. 6
    • C. 7
    • D. 8
    • Discuss
    • 6. In how many different ways can the letters of the word 'HAPPYHOLI' be arranged?

    • Options
    • A. 89,972
    • B. 90,720
    • C. 72,000
    • D. 81,000
    • Discuss
    • 7. The letters of the word PROMISE are to be arranged so that three vowels should not come together. Find the number of ways of arrangements?

    • Options
    • A. 4320
    • B. 4694
    • C. 4957
    • D. 4871
    • Discuss
    • 8. In how many ways can letter of the word RAILINGS arrange so that R and S always come together?

    • Options
    • A. 1260
    • B. 2520
    • C. 5040
    • D. 1080
    • Discuss
    • 9. In a bag, there are 8 red, 7 blue and 6 green flowers. One of the flower is picked up randomly. What is the probability that it is neither red nor green ? A) 13 B)821 C)621 D)2021

    • Options
    • A. Option A
    • B. Option B
    • C. Option C
    • D. Option D
    • Discuss
    • 10. In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there ?

    • Options
    • A. 205
    • B. 194
    • C. 209
    • D. 159
    • Discuss


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