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JEE Advanced Model Paper 15 with solutions for online practice

Passage-1

Suppose a set X contain different 4 x 4 arrays with each entry as 1 or - 1 and having the property that the sum of the entries in each column is 0 and the sum of entries in each row is 0

Question : 49

Total: 60

If a set P ⊆ X be chosen at random, find probability that it contains different 4 x 4 arrays whose first two columns share same two numbers in each row

2/5
8/15
4/15
1/15

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