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    • Quant Boosters - Rajesh Balasubramanian - Set 2
      Quant - Boosters • permutation & combination • • rajesh_balasubramanian  

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      Exactly one of ab, bc and ca is odd => Two are odd and one is even abc is a multiple of 4 => the even number is a multiple of 4 The arithmetic mean of a and b is an integer => a and b are odd and so is the arithmetic mean of a, b and c. => a+ b + c is a multiple of 3 c can be 4 or 8. c = 4; a, b can be 3, 5 or 5, 9 c = 8; a, b can be 3, 7 or 7, 9 Four triplets are possible.
    • Quant Boosters - Rajesh Balasubramanian - Set 1
      Quant - Boosters • permutation & combination • • rajesh_balasubramanian  

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      No two boys sit next to each other => Boys and girls must alternate. As they are seated around a circular table, there is no other possibility. Now, 4 boys and 4 girls need to be seated around a circular table such that they alternate. Again, let us do this in two steps. Step I: Let 4 boys occupy seats around a circle. This can be done in 3! ways. Step II: Let 4 girls take the 4 seats between the boys. This can be done in 4! ways. Note that when the girls go to occupy seats around the table, the idea of the circular arrangement is gone. Girls occupy seats between the boys. The seats are defined as seat between B1 & B2, B2 & B3, B3 & B4 or B4 & B1. So there are 4! ways of doing this. Total number of ways = 3! × 4! = 6 × 24 = 144
    • Finding Number of Positive & Non-Negative Integral Solutions For a + b + c + ... = N & Its Applications
      Quant Primer • theory of equations permutation & combination • • zabeer  

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    • Permutations & Combinations - Nikhil Goyal
      Quant Primer • permutation & combination • • Nikhil Goyal  

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    • Permutations & Combination : Fundamental Principles Of Counting - Ravi Handa
      Quant Primer • permutation & combination • • handakafunda  

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    • Permutations and Combinations - Anubhav Sehgal
      Quant Primer • permutation & combination • • anubhav_sehgal  

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    • Permutation & Combination - Abhishek Singhania, IIM Lucknow
      Quant Primer • permutation & combination • • mbatious  

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    • Permutation & Combination Concepts by Gaurav Sharma - Part (2/2)
      Quant Primer • permutation & combination • • gaurav_sharma  

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    • Permutation & Combination Concepts by Gaurav Sharma - Part (1/2)
      Quant Primer • permutation & combination • • gaurav_sharma  

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    • The Feline Trouble Beckons - This time It’s PnC and its applications - Ankan Sengupta, FMS Delhi
      Quant Primer • permutation & combination • • ankan_sengupta  

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    • Demystifying Permutation & Combination - Rajesh Balasubramanian - CAT 100th Percentile - CAT 2011, 2012, 2014 & 2017
      Quant Primer • permutation & combination • • rajesh_balasubramanian  

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