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Permutations and Combinations question

2025 · 7 Apr · Shift 1 · Q26
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Permutations and Combinations question

2025 · 7 Apr · Shift 1 · Q26

JEE MainMathematicsPermutations and CombinationsMCQ+4 / −1
From a group of 7 batsmen and 6 bowlers, 10 players are to be chosen for a team, which should include atleast 4 batsmen and atleast 4 bowlers. One batsmen and one bowler who are captain and vice-captain respectively of the team should be included. Then the total number of ways such a selection can be made, is
  1. A
    145
  2. B
    165
  3. C
    155
  4. D
    135
View written solutionFree

Correct answer: C

  1. Interpret the condition carefully

We have:

  • 777 batsmen, among whom one specific batsman must be included as captain.
  • 666 bowlers, among whom one specific bowler must be included as vice-captain.

A team of 101010 players is to be selected such that:

  • at least 444 batsmen are included,
  • at least 444 bowlers are included,
  • the specified captain and vice-captain must be included.

Since only batsmen and bowlers are available, if the team has bbb batsmen and www bowlers, then b+w=10b+w=10b+w=10 with b≥4,w≥4.b\ge 4, \quad w\ge 4.b≥4,w≥4.

  1. Possible compositions of the team

From b+w=10b+w=10b+w=10 and both at least 444, the possibilities are:

  • (4,6)(4,6)(4,6)
  • (5,5)(5,5)(5,5)
  • (6,4)(6,4)(6,4)

We now count each case, ensuring the fixed captain batsman and fixed vice-captain bowler are included.


  1. Case 1: 4 batsmen and 6 bowlers
  • Since all 666 bowlers are selected, and the vice-captain bowler is among them automatically, bowlers can be chosen in (55)=1\binom{5}{5}=1(55​)=1 way after fixing the vice-captain.

  • For batsmen, one fixed captain is already included. We need 333 more from the remaining 666 batsmen: (63)=20.\binom{6}{3}=20.(36​)=20.

So total ways in this case: 20⋅1=20.20 \cdot 1=20.20⋅1=20.


  1. Case 2: 5 batsmen and 5 bowlers
  • Batsmen: captain is fixed, so choose 444 more from remaining 666: (64)=15.\binom{6}{4}=15.(46​)=15.

  • Bowlers: vice-captain is fixed, so choose 444 more from remaining 555: (54)=5.\binom{5}{4}=5.(45​)=5.

So total ways in this case: 15⋅5=75.15 \cdot 5=75.15⋅5=75.


  1. Case 3: 6 batsmen and 4 bowlers
  • Batsmen: captain is fixed, so choose 555 more from remaining 666: (65)=6.\binom{6}{5}=6.(56​)=6.

  • Bowlers: vice-captain is fixed, so choose 333 more from remaining 555: (53)=10.\binom{5}{3}=10.(35​)=10.

So total ways in this case: 6⋅10=60.6 \cdot 10=60.6⋅10=60.


  1. Add all cases

Total number of teams: 20+75+60=155.20+75+60=155.20+75+60=155.

  1. Compare with options

The correct option is 155\boxed{155}155​ which is Option C.

  1. Comparison with stored answer

Stored correct answer: C

Our derived answer is also C.

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