Discussion
Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series. a _ z b _ y c _ x _ a z _ b y c c _ a a _ b b _ c c x _ a z _ b y _ c x
Answer: A
The series is the block aaz bby ccx repeated. Placing abcabxzyabc in the 11 blanks in order gives a(a)zb(b)yc(c)x(a)az(b)bycc(x)aa(z)bb(y)ccx(a)az(b)by(c)cx, which reads aaz bby ccx aaz bby ccx aaz bby ccx aaz bby ccx without a break.
The other options put a letter other than the required one in an early blank. For example, acbacxzyabc makes the second block read bcy instead of bby, so the repeating pattern breaks.
A quick test of the key is that every third letter in the completed string runs z, y, x, then repeats, with the first letters running a, b, c in pairs.
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