TCS Company Logical Reasoning Blood Relations

Given the following information which option must be true
i) A occurs only if B or C occurs.
ii)B occurs only if D and E occur
iii)F occurs only if C does not occur
iv)G occurs only if both A and F occurs

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TCS Other Question

A 3-gallon mixture contains one part S and two parts R. In order to change it to a mixture containing 25% S, how much R should be added?
(a) 1/2 gallon
(b) 2/3 gallon
(c) 3/4 gallon
(d) 1 gallon
(e) 1 1/2 gallon
3 white chips, 7 blue chips, 16 green chips, 2 chips drawn from the box in succession what is the probability that one is blue and other is white?
a) 7/50 b) 8/30 c) 7/25 d) 20/26