1. Identify the number that does not belong to the number series given below 789, 645, 545, 481, 440, 429, 425
a) 789 b) 545 c) 440 d) 429 e) 425
2. In the following letter series, some of the letters are missing which are given in that order as one of the alternatives below it.
Choose the correct alternative: m n o n o p o q p q r s _ _ _ _
A) o q r s B) m o p q C) q r s t D) m n o p E) p q r s
3. Find the correct option at the place of the question mark: Q1F, S2E, U6D, W21C, ?
A) Z88B B) Y88B C) Y66B D) Z44A E) Y44B
4. Find the correct option at the place of the question mark: 2, 4, 12, 6, 12, 36, 18, 36, 108, ?
A) 72 B) 54 C) 90 D) 108 E) 75
5. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
If the series is written in reverse, which will be the eighth letter to the right of O?
A) I B) G C) Q D) H E) S
6. Same reversed alphabet series.
Find the fifth letter to the left of the ninth letter from the right.
A) M B) W C) O D) N E) L
7. Last 10 letters of the series reversed: Q R S T U V W X Y Z → Z Y X … Q
Which letter is sixth to the right of the thirteenth letter from the left?
A) X B) W C) G D) V E) Y
8. Find the 288th term in the series:
a, b, b, c, c, c, d, d, d, d, e, e, e, e, e, f, f, f, f, f, f, …
A) u B) x C) v D) w E) y
Solutions
- Correct Answer: D
The pattern here is that there is a difference of square of an even number between the two numbers in this sequence, i.e., 789- (12^2) = 645
645-(10^2) = 545 and so on
However, in the case of 429, there is a problem and obviously the number is missing here.
so 481 – (6^2) = 445
445 – (4^2) = 429
Hence, the missing number is 445
2. The pattern repeats with slight offset: m→n→o, then shifts through the alphabet. Final sequence continues logically with p q r s.
3. Correct Answer: B
First letters: Q, S, U, W → increase by +2 → Next: Y
Numbers: 1, 2, 6, 21 → multiply pattern: ×1, ×2, ×3.5
Next: 21 × 4.2 = 88
Letters: F, E, D, C → go backward → Next = B → Final: Y88B
4. Correct Answer: A
Split into three sub-series:
2, 6, 18, ? → ×3 pattern → next: 54
4, 12, 36 → ×3 → next: 108
12, 36, 108 → ×3 → next: 324
But full pattern focuses on multiplying previous value by 3 in each third position.
Looking at every third term: 18 → ?
→ 18 × 3 = 54
5. If the series is written in reverse, which will be the eighth letter to the right of O?
In the normal order: A to Z.
Reversed: Z Y X … A
O is the 15th letter from the left in normal order. So in reverse, O is at position 12 (since Z is 1st, Y is 2nd, …, A is 26th).
From position 12, the 8th letter to the right is at position 12 + 8 = 20.
20th letter in reversed series is G.
Answer: B) G
6: Find the fifth letter to the left of the ninth letter from the right (reversed alphabet).
Reversed alphabet: Z (1) to A (26)
Ninth letter from right = 9th letter in reversed order = R (position 9)
Now count 5 to the left: 9 – 5 = 4th letter
4th letter in reversed series is W
Answer: B) W
7.: Last 10 letters reversed: Z Y X W V U T S R Q
Find the sixth to the right of the thirteenth letter from the left.
Thirteenth letter from the left in full reversed alphabet is N (since Z=1, …, N=13)
Now sixth to the right = position 13 + 6 = 19
19th letter in full reversed series is H
Answer: Not in given options. Correct answer is H.
If the question meant within last 10 reversed letters, there is a mismatch. Please clarify.
8. Correct Answer: B) x
Letter n repeats n times.
Sum till 23 = 276, so 288 falls in 24th block → x.
