the two questions 122 and 126 are kind of ambiguous(answers actually)
let me put question here
Q122). If v and W are diffferent integers, does v=0
for me the answer should be D. Whereas the answer is A. Please explain.
Given: v # w (not equal to)
Is v = 0?
A: vw = v^2
v(w-v) = 0, which means either v =0 or v = w... but since it's given v # w, this mean v = 0. Hence SUFF
B: w = 2
v could be anything but 2.... hence NOT SUFF....
Q126) if zexpn=1 what is the value of Z.
A) n is a non zero ineger
answer given is C. My answer is A. Please explain.
given z^n = 1
ques: z = ?
A) n # 0 .
Hence z^n = 1 means z can be -1 or +1 because (-1)^2 = 1 and (1)^2 = 1. Hence Not SUFF
Not Suff... as z could be anything.
A+B = SUFF as now z can only be 1 if n # 0.
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