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Get access to the detailed solutions to the previous years questions asked in IIM IPMAT exam
It can be seen that Q(k) will always contain composite numbers and never a prime number, for example:
Q(2) will have 4, 6, 8, 10....24
Q(3) will have 6, 9, 12,.....24
It means that P - 
Q(k) will be the set of all the prime numbers between 2 and 25 (including 2 and 25)
∴ The required set = {2, 3, 5, 7, 11, 13 ,17, 19, 23}
Hence, 9 elements