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211. QAR, RAS, SAT, TAU, _____

Discuss
Solution:
In this series, the third letter is repeated as the first letter of the next segment. The middle letter, A, remains static. The third letters are in alphabetical order, beginning with R.
212. DEF, DEF2, DE2F2, _____, D2E2F3

Discuss
Solution:
In this series, the letters remain the same: DEF.

The subscript numbers follow this series:

111, 112, 122, 222, 223, 233, 333, ...

213. QAR, RAS, SAT, TAU, _____

Discuss
Solution:
In this series, the third letter is repeated as the first letter of the next segment. The middle letter, A, remains static. The third letters are in alphabetical order, beginning with R.
214. QAR, RAS, SAT, TAU, _____

Discuss
Solution:
In this series, the third letter is repeated as the first letter of the next segment. The middle letter, A, remains static. The third letters are in alphabetical order, beginning with R.
215. Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

a_bbc_aab_cca_bbcc

Discuss
Solution:
The pattern is,
aabbccaabbccaabbcc.
The pattern aabbcc is repeated.
216. Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

_ bc _ ca _ aba _ c _ ca

Discuss
Solution:
The series is,
abc b ca c aba b c b ca.
The letters are changing their place in a cycling order.
217. Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

_ ab _ b _ aba _ _ abab.

Discuss
Solution:
aabab / aabab / aabab.
The pattern is repeated aabab.
218. Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

bca _ b _ aabc _ a _ caa

Discuss
Solution:
The series is,
bcaa / bcaa / bcaa / bcaa.
bcaa pattern is reapeated.
219. Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

b _ac _ cc _ cb _ ab _ ac

Discuss
Solution:
The series is,
baac / accb / cbba / baac
220. Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

aab _ aa _ bbb _ aaa _ bbba

Discuss
Solution:
The series is,
aabb / aaabbb / aaaabbbb / a.
Thus letters are repeated twice, then thrice then four times and so on.