Number Series

Series: 2, 4, 8, 16, ?

Step 1: Multiply each number by 2.

2 × 2 = 4
4 × 2 = 8
8 × 2 = 16

Step 2: 16 × 2 = 32

Answer: C) 32 ✅

Series: 3, 6, 11, 18, ?

Step 1: Check the differences:
6 - 3 = 3
11 - 6 = 5
18 - 11 = 7

Step 2: The pattern is +3, +5, +7 → next is +9

18 + 9 = 27

Answer: A) 27 ✅

Series: 100, 97, 91, 82, ?

Step 1: Check the differences:
97 - 100 = -3
91 - 97 = -6
82 - 91 = -9

Step 2: The pattern is -3, -6, -9 → next is -12

82 - 12 = 70

Answer: C) 70 ✅

Series: 1, 4, 9, 16, 25, ?

Step 1: These are square numbers:
1² = 1
2² = 4
3² = 9
4² = 16
5² = 25

Step 2: 6² = 36

Answer: A) 36 ✅

Series: 5, 10, 20, 40, ?

Step 1: Multiply by 2 each time:
5 × 2 = 10
10 × 2 = 20
20 × 2 = 40

Step 2: 40 × 2 = 80

Answer: D) 80 ✅

Series: 1, 2, 6, 24, ?

Step 1: This is a factorial pattern:

1 = 1
2 = 1 × 2
6 = 1 × 2 × 3
24 = 1 × 2 × 3 × 4

Step 2: Next is 1 × 2 × 3 × 4 × 5 = 120

Answer: C) 120 ✅

Series: 81, 27, 9, 3, ?

Step 1: Divide by 3 each time:
81 ÷ 3 = 27
27 ÷ 3 = 9
9 ÷ 3 = 3

Step 2: 3 ÷ 3 = 1

Answer: B) 1 ✅

Series: 13, 16, 22, 31, ?

Step 1: Check the differences:
16 - 13 = 3
22 - 16 = 6
31 - 22 = 9

Step 2: Pattern: +3, +6, +9 → next is +12

31 + 12 = 43

Answer: C) 43 ✅

Series: 2, 5, 10, 17, ?

Step 1: Check the differences:
5 - 2 = 3
10 - 5 = 5
17 - 10 = 7

Step 2: Pattern: +3, +5, +7 → next is +9

17 + 9 = 26

Answer: B) 26 ✅

Series: 20, 18, 15, 11, ?

Step 1: Check the differences:
20 - 18 = 2
18 - 15 = 3
15 - 11 = 4

Step 2: Pattern: -2, -3, -4 → next is -5

11 - 5 = 6

Answer: A) 6 ✅

Series: 1, 1, 2, 3, 5, 8, ?

Step 1: This is a Fibonacci series:

Each number = sum of previous two:
1 + 1 = 2
1 + 2 = 3
2 + 3 = 5
3 + 5 = 8

Step 2: 5 + 8 = 13

Answer: B) 13 ✅

Series: 121, 100, 81, 64, ?

Step 1: These are square numbers:

11² = 121
10² = 100
9² = 81
8² = 64

Step 2: 7² = 49

Answer: A) 49 ✅

Series: 7, 14, 28, ?, 112

Step 1: Multiply by 2:

7 × 2 = 14
14 × 2 = 28
28 × 2 = 56
56 × 2 = 112

Answer: B) 56 ✅

Series: 10, 20, 30, 50, 80, ?

Step 1: Check the pattern:

10 → +10 = 20
20 → +10 = 30
30 → +20 = 50
50 → +30 = 80

Step 2: 80 + 50 = 130

Answer: C) 130 ✅

Series: 9, 18, 36, ?, 144

Step 1: Multiply by 2:

9 × 2 = 18
18 × 2 = 36
36 × 2 = 72
72 × 2 = 144

Answer: B) 72 ✅

Series: 3, 6, 18, 72, ?

Step 1: Check the pattern:

3 × 2 = 6
6 × 3 = 18
18 × 4 = 72

Step 2: 72 × 5 = 360

Answer: D) 360 ✅

Series: 6, 11, 21, 36, ?

Step 1: Check the differences:
11 - 6 = 5
21 - 11 = 10
36 - 21 = 15

Step 2: Pattern: +5, +10, +15 → next is +20

36 + 20 = 56

Answer: A) 56 ✅

Series: 4, 9, 19, 39, ?

Step 1: Check the differences:
9 - 4 = 5
19 - 9 = 10
39 - 19 = 20

Step 2: Pattern: +5, +10, +20 → next is +40

39 + 40 = 79

Answer: C) 79 ✅

Series: 90, 82, 74, 66, ?

Step 1: Check the differences:
90 - 82 = 8
82 - 74 = 8
74 - 66 = 8

Step 2: Continue subtracting 8
66 - 8 = 58

Answer: B) 58 ✅

Series: 10, 15, 20, ?, 30

Step 1: Check the differences:
15 - 10 = 5
20 - 15 = 5

Step 2: Pattern: +5 each time

20 + 5 = 25

Answer: C) 25 ✅

Series: 1, 3, 7, 15, 31, ?

Step 1: Observe the pattern:
1 × 2 + 1 = 3
3 × 2 + 1 = 7
7 × 2 + 1 = 15
15 × 2 + 1 = 31

Step 2: 31 × 2 + 1 = 63

Answer: A) 63 ✅

Series: 17, 34, 68, ?, 272

Step 1: Multiply by 2 each time:
17 × 2 = 34
34 × 2 = 68
68 × 2 = 136
136 × 2 = 272

Answer: C) 136 ✅

Series: 5, 6, 11, 17, 28, ?

Step 1: Check the differences:
6 - 5 = 1
11 - 6 = 5
17 - 11 = 6
28 - 17 = 11

Step 2: Pattern alternates: +1, +5, +6, +11 → next is +17

28 + 17 = 45

Answer: B) 45 ✅

Series: 4, 8, 12, 20, 28, ?

Step 1: Check the differences:
8 - 4 = 4
12 - 8 = 4
20 - 12 = 8
28 - 20 = 8

Step 2: Pattern: +4, +4, +8, +8 → next is +8

28 + 8 = 36

Answer: A) 36 ✅

Series: 0, 1, 3, 6, 10, ?

Step 1: Check the differences:
1 - 0 = 1
3 - 1 = 2
6 - 3 = 3
10 - 6 = 4

Step 2: Pattern: +1, +2, +3, +4 → next is +5

10 + 5 = 15

Answer: A) 15 ✅

Series: 100, 90, 81, 73, ?

Step 1: Check the differences:
100 - 90 = 10
90 - 81 = 9
81 - 73 = 8

Step 2: Pattern: -10, -9, -8 → next is -7

73 - 7 = 66

Answer: A) 66 ✅

Series: 2, 6, 12, 20, ?

Step 1: Check the differences:
6 - 2 = 4
12 - 6 = 6
20 - 12 = 8

Step 2: Pattern: +4, +6, +8 → next is +10

20 + 10 = 30

Answer: A) 30 ✅

Series: 6, 13, 26, 45, ?

Step 1: Check the differences:
13 - 6 = 7
26 - 13 = 13
45 - 26 = 19

Step 2: Pattern: +7, +13, +19 → increasing by 6
Next difference: 19 + 6 = 25

45 + 25 = 70

Answer: A) 70 ✅