Elitmus Exam Category

elitmus aspirants
Could anyone please tell me what are the topics I should prepare for problem solving,verbal ability and books to go through for those topics

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Elitmus Other Question

There are 10 pair of socks in a cupboard from which 4 individual socks are picked at random. The probability that there is at least one pair is:
a) 195/323
b) 99/323
c) 198/323
d) 185/323 given s(n) sum of first n natural no's then z(n)=2 s(n)+41 least value of n that gives z(n) is not prime?
a)z(n) always prime
b)6
c)7
d)41