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281. Choose the correct order of the given alternative : 23B _ 6 _ F G _ 5D _ 8 _ H I

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Solution:
From the alternatives, it is clear that the series can be divided in to 4 terms each - each group comprising of two numbers followed by two letters, as shown below
23 B _ / 6 _ F G/_ 5 D _ / 8 _ H I
Clearly, the first number in each group represents the position of the letter at the third place, in the English alphabet. Thus, the third missing term is the number corresponding to the position of D in English alphabet i.e., 4, which is given in (1).
Substituting other terms of (1) into the series, wer get:
23BC/67FG/45DE/ 89HI
Observe that the second number in each group represents the position of the letter at the fourth place, in the English alphabet.
282. Choose the correct order of the given alternative : F _ U6 _ 9I _ T7 _ 20 _ 4D23

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Solution:
From the alternatives, it is clear that the series can be divided in to 4 groups of four terms each - each group comprising of two letters and two numbers, occurring alternately..
F _ U6/ _ 9I _ / T7 _ 20 / _ 4D23
4D indicates that in a group, the number at the second place denotes the position of the letter at the third place, in the English alphabet.
T7 _ 20 indicates that in a group, the number at the fourth place denotes the position of the letter at the first place, in the English alphabet.
Thus, putting A = 1, B = 2......Y = 25, Z = 26. we have ,
1st missing term = U = 21;
3rd missing term = 7th letter = G
5th missing term = 23 letter = W.
283. Choose the correct order of the given alternative : Z _ 25 Y B 23 X C _ W _ 19 _ E 17

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Solution:
From the alternatives, it is clear that the series can be divided in to 5 groups of three terms each - each group comprising of two letters followed by a number.
Z _ _ 25/ YB23 / XC _ _ / W _ 19 / _ E 17
Observing the group Y B 23, we find that in a group, the number is the difference of the numbers representing the positions of the two letters in the English alphabet.
Thus, putting A = 1, B = 2, ......Y = 25, Z = 26, we have
Y - B = 25 - 2 = 23.
Similarly, missing term in 1st group = Z - 25 = 26 - 25 = 1 = ASo, the first and second missing terms are A and 21 respectively, which are given only in (A).
284. Choose the correct order of the given alternative : a _ _ dba _ _ bcad _ _ da _ _ cd

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Solution:
acbd/bacd/bcad/dcda/bacd
So, option (A) is correct.
285. Which one set of letters when sequentially placed at the gapes in the given letters series shall complete it ?
BR _ _ NB _ O _ NB

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Solution:
BROWN / BROWN / B
So, option (A) is the answer .
286. Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?
ipi _ upog _ pig _ pogi _ _ g

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Solution:
ip/ig/up/og/ip/ig/up/og/ip/ig
So, option (D) is the correct answer .
287. Choose the correct order of the given alternative : b _ ab _ b _ aab _ b

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Solution:
ba/ab/ab/ba/ab/bb
288. Choose the correct order of the given alternative : ccbab _ caa _ bccc _ a _

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Solution:
cc / ba / bb / ca / aa / bc / cc / ba / b
So, option (B) is correct.
289. Choose the correct order of the given alternative : _ bcab _ cabc _ abca _ b

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Solution:
abc / abb / cab / cca / bca / ab