TCS Company Numerical Ability Probability

how many number of qns we shd prepare frm m4maths to clear the aptitude test???

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TCS Other Question

A boy buys 18 sharpners (brown or white) for Rs.100. For every white sharpner, he pays 1 rupee more than the brown sharpner. What is the cost of white sharpner and how much did he buy?
Option
a) 5,13
b) 5,10
c) 6,10 d
d) None of these
Given the following information,which is true?
1)A occurs only if either B or C occurs
2)B occurs only if both D and E occurs
3)F occurs only if C doesnot occur
4)G occurs only if both A and F occur
options are
A.none of these
B.G doesnot occur if D doesnot occur
C.A occurs whenever
F occurs
D.F never occurs