Past paper MCQS of Letter and Number series

12,37,72,152, ....

• 312

• 325

• 515

• 613

Answer explanation

12+20=32

32+40=72

72+80=152

so 160 should be added in 152

152+160=312

Complete the sequence : 2, 15, 41,80,....

• 111

• 120

• 121

• 132

Answer explanation

Multiples of 13 are being added +13+26+39 so now you will add 52

8,10,14,18, .... ,34,50,66

• 24

• 25

• 26

• 27

Answer explanation

The increasing order is +2,+4,+4,+8,+16,+16

8+2=10

10+4=14

14+4=18

18+8=26

What number comes next in the following series?

34,24,16,10,6

• 5

• 10

• 2

• 4

Answer explanation

34-10=24

24-8=16

16-6=10

10-4=6

6-2=4

Find the missing series:

3,12,27,48,75,108, ?

• 147

• 162

• 183

• 192

Answer explanation

The correct answer is 147.

3 × 1² = 3

3 × 2² = 12

3 × 3² = 27

3 × 4² = 48

3 × 5² = 75

3 × 6² = 108

3 × 7² = 147

147 is missing number.

3, 6, 18, 72, ....

• 144

• 216

• 288

• 360

Answer explanation

The pattern is : times 2 , then times 3, then times 4,so times 5 to get 360.

If 7(x-2) =3x -2. what is the value of x ?

• -4

• -3

• 2

• 3

Answer explanation

A series is given with missing terms. Choose the correct alternative from the given ones that will complete the series. 4E, 8I, 13N, 19T, ?

• 26U

• 26A

• 26Z

• 25A

Answer explanation

The first number and second letter moves 4,5,6,...., steps forward in the English alphabetical order.

19+7= 26

T +7 =A

So, the required sequence is 26A.

Find the missing series 2,3,8,63, ?

• 3900

• 3636

• 3968

• 3988

Answer explanation

The pattern is:

2 ^Λ 2 = 4-1= 3

3 ^Λ 2 = 9-1= 8

8 ^Λ 2 = 64-1= 63

63 ^Λ 2 = 3969-1= 3968

Look at this series 80,10,70,15,60. What should comes next?

• 20

• 25

• 30

• 50

Answer explanation