The series is formed of two repeated alphabet at start and end but middle alphabet is not repeated. The word is formed with the help of combination of reordering of abc.
aabcc/ccabb/bbcaa ? accba
The word aabcd is formed.
2nd word is made by changing to the 2nd position with next alphabet, similarly
3rd word is made by changing to the 3rd position with next alphabet,
4th word is made by changing to the 4th position with next alphabet.
aabcd/abbcd/abccd/abcdd ? adbbad
The sequence is made of repetition of two blocks cab and bac alternatively.
cab/bac/cab/bac/cab/bac ? acbcb
The sequence is made of repetition of two blocks acbd and cadb alternatively.
acbd/cadb/acbd/cadb/acbd ? addddb
The sequence is made of repetition of abc in different order, so identify the missing alphabet in abc .
second word is reverse of first word, similar way 4th word is reverse of 3r word.
By option (d),
abc/cba/bca/acb ? bcba
Using the proper symbols in ( c ), we get
5 x 2 ÷ 2 < 10 -4 + 8
After Replacing the Sign Apply the BODMAS Rule.
?  5 x 1 < 18 - 4
?  5 < 14
which is true .
The series is made of two consecutive 'A' and three consecutive 'B' in alternate manner.
AA'B/BB'A/A'AB/B'BA ? ABAB
The given series is combination of yzy and xzx .
Arrange the word as per given suggestion, we will get
yzy/xzx/yzy/xzx/yzy/xzx/y ? yxzyz
The sequence is made of abcd in random order.
The 3rd letter is replacing at first place and all other letter moving forward one step ahead except fourth letter.
acdb/dacb/cdab/acdb/da ? adabcd
The first word is abba. second word will start from a and second n third letter will next alphabetical letter , similar for 3rd and 4th words also.
abba/acca/adda/aeea
Hence, Answer will be bacde and these letters will come in gap, respectively.
initial letters are going to add two more letters in each next words and last letters are going backward two positions in back direction.
Initials letters
ab, then abcd, then abcdef
Last letters
ZY then XW then VU
abzy/abcdxw/abcdefvu ? zdu
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