- 1, 6, 13, 22, 33,
A. 35

B. 36

C. 48

D. 49

Answer

:B .

Justification:

The numbers are 1^{2}, 2^{2}, 3^{2}, 4^{2}, 5^{2}.

.’. Missing number = 6^{2 }= 36.

2. 20, 19, 17, x , 10, 5

A. 12

B. 13

C. 14

D. 15

Answer: C . 14

Justification:

The Pattern is – 1, – 2,…

.’. Missing number = 17 – 3 = 14.

3. 2, 3, 5, 7, 11, x, 17

A. 12

B. 13

C. 14

**D.** 15

Answer: B . 13

Justification:

Clearly, the given series consists of prime numbers starting from 2. The prime number after 11 is 13.

So, 13 is the missing number.

4. 6, 11, 21, 36, 56,

A. 42

B. 51

C. 81

D. 91

Answer: C . 81

Justification:

The pattern is + 5, + 10, + 15, + 20,….

.’. Missing Number = 56 + 25 = 81

5. 1, 6, 13, 22, 33,

A. 44

B. 45

C. 46

D. 47

Answer: C . 46

Justification:

The pattern is + 5, + 7, + 9, + 11,…

.’. Missing number = 33 + 13 = 46.

6. 3, 9, 27, 81,

A. 324

B. 243

C. 210

D. 162

Answer: B . 243

Justification:

Each term of the given series is obtained by multiplying its preceding term by 3.

.’. Missin number = 81 * 3 = 243.

7. 1, 9, 17, 33, 49, 73,

A. 97

B. 98

C. 99

D. 100

Answer: A . 97

Justification:

The pattern is + 8, + 8, + 16, + 24,….

.’. Missing number = 73 + 24 = 97

8. 2, 5, 9, , 20, 27

A. 14

B. 16

C. 18

D. 24

Answer: A . 14

Justification:

The pattern is + 3, + 4,….

.’. Missing number = 9 + 5 = 14.

9. 5, 9, 17, 29, 45,

A. 60

B. 65

C. 68

D. 70

Answer: B . 65

Justification:

The pattern is + 4, + 8, + 12, + 16, …

.’. Missing number = 45 + 20 = 65.

10. 3, 7, 15, 31, 63,

A. 92

B. 115

C. 127

D. 131

Answer: C . 127

Justification:

Each number in the series is the preceding number multiplied by 2 and then increased by 1.

Thus, (3 * 2) + 1 = 7,

(7 * 2) + 1 = 15,

(15 * 2) + 1 = 31 ans so on.

.’. Missing number = (63 * 2) + 1 =127.

11. U, O, I, ?, A

A. E

B. C

C. S

D. G

Answer: A . E

Justification:

The series consists of vowles A, E, I, O, U written in a reverse order

12. Y, W, U, S, Q, ?, ?

A. N, J

B. M, L

J, R

C. L, M

D. O, M

Answer: E . O, M

Justification:

The series consits of alternate letters in reverse order.

13. A, B, D, G, ?

A. M

B. L

C. K

D. H

Answer: C . K

Justification:

The first, second, third,…. letters of the series are respectively moved one, two, three,… steps forward to obtain the seccessive terms.

14. Z, U, Q, ?, L

A. I

B. K

C. M

D. N

Answer: D . N

Justification:

The first, second, third,… letters of the series are respectively moved one, two, three,… steps forward to obtain the successive terms.

15. A, C, F, H, ?, M

A. L

B. K

C. J

D. I

Answer: B . K

Justification:

The letters are alterntely moved two and three steps forward to obtainthe successive terms.

16. G4T, J10R, M20P, P43N, S90L

A. G4T

B. J10R

C. M20P

D. P43N **E.**S90L

Answer: B . J10R

Justification:

The first letter of each term is moved three steps forward and

the last letter is moved two steps backward to obatin the corresponding letters of the next term.

The numbers follow the sequence x 2 + 1, x 2 + 2, x 2 + 3, x 2 + 4.

So, 10 is wrong and must be replaced by (4 x 2 + 1) i.e. 9.

17_ _ aba _ _ ba _ ab

abbbaAbbabBaabbBbaba

Answer:

B . abbab

Justification:

The series is __ab__ / ab / a__b__ / __a__b / a__b__ / ab.

Thus, the pattern ab is repeated.

18. ab _ _ _ b_ bbaa _

A. abaab

B. Abbab

C. Baaab

D. Babba

Answer: C . baaab

Justification:

The series is ab__b__ / __aa__b / __a__bb / aa__b__.

Thus, the pattern abb, aab is repeated.

19. _ baa _ aab _ a _ a

A. aabb

B. Aaba

C. Abab

D. Baab

Answer: C . abab

Justification:

The series is __a__ba / a__b__a / ab__a__ / a__b__a.

Thus, the pattern aba is repeated.

20. _ _ babbba _ a _ _

A. ababb

B. Baaab

C. Bbaba

D. Babbb

Answer: D . babbb

Justification:

The series is __ba__babb / ba__b__a__bb__.

Thus, the pattern bababb is repeated