Q.1 Find the missing number: 2, 6, 12, 20, ? , 42
28
30
32
36
Explanation - The pattern adds consecutive even numbers: 2+4=6, 6+6=12, 12+8=20, 20+10=30, 30+12=42.
Correct answer is: 30
Q.2 Find the missing number: 5, 10, 20, 40, ?
60
70
80
100
Explanation - Each number is multiplied by 2: 5*2=10, 10*2=20, 20*2=40, 40*2=80.
Correct answer is: 80
Q.3 Find the missing number: 1, 1, 2, 6, 24, ?
120
60
48
36
Explanation - This is the factorial series: 1!=1, 2!=2, 3!=6, 4!=24, 5!=120.
Correct answer is: 120
Q.4 Find the missing number: 3, 9, 27, ?, 243
54
81
72
90
Explanation - Each term is multiplied by 3: 3*3=9, 9*3=27, 27*3=81, 81*3=243.
Correct answer is: 81
Q.5 Find the missing number: 7, 14, 28, 56, ?
84
112
98
70
Explanation - Each number is multiplied by 2: 7*2=14, 14*2=28, 28*2=56, 56*2=112.
Correct answer is: 112
Q.6 Find the missing number: 2, 4, 8, 32, ?
64
128
256
16
Explanation - The pattern multiplies sequentially by 2, then 2, then 4: 2*2=4, 4*2=8, 8*4=32, 32*4=128.
Correct answer is: 128
Q.7 Find the missing number: 11, 21, 31, 41, ?
49
51
52
55
Explanation - This is an arithmetic series increasing by 10: 11+10=21, 21+10=31, 31+10=41, 41+10=51.
Correct answer is: 51
Q.8 Find the missing number: 1, 4, 9, 16, ?
20
25
24
30
Explanation - These are perfect squares: 1^2=1, 2^2=4, 3^2=9, 4^2=16, 5^2=25.
Correct answer is: 25
Q.9 Find the missing number: 2, 5, 10, 17, ?
24
26
30
28
Explanation - Pattern is n^2 + 1: 1^2+1=2, 2^2+1=5, 3^2+1=10, 4^2+1=17, 5^2+1=26.
Correct answer is: 26
Q.10 Find the missing number: 1, 2, 6, 24, ?
120
60
36
72
Explanation - This is the factorial series: 1!=1, 2!=2, 3!=6, 4!=24, 5!=120.
Correct answer is: 120
Q.11 Find the missing number: 10, 20, 40, 80, ?
160
180
200
150
Explanation - Each number is multiplied by 2: 10*2=20, 20*2=40, 40*2=80, 80*2=160.
Correct answer is: 160
Q.12 Find the missing number: 5, 11, 23, 47, ?
95
99
97
101
Explanation - Pattern doubles and subtracts 1: 5*2+1=11, 11*2+1=23, 23*2+1=47, 47*2+1=95.
Correct answer is: 95
Q.13 Find the missing number: 3, 6, 18, 72, ?
144
216
288
432
Explanation - Pattern multiplies by increasing integers: 3*2=6, 6*3=18, 18*4=72, 72*4=288.
Correct answer is: 288
Q.14 Find the missing number: 2, 3, 5, 9, 17, ?
31
33
35
37
Explanation - Pattern: add consecutive powers of 2: 2+1=3, 3+2=5, 5+4=9, 9+8=17, 17+16=33.
Correct answer is: 33
Q.15 Find the missing number: 4, 9, 19, 39, ?
79
78
77
75
Explanation - Pattern doubles and adds 1: 4*2+1=9, 9*2+1=19, 19*2+1=39, 39*2+1=79.
Correct answer is: 79
Q.16 Find the missing number: 1, 8, 27, 64, ?
100
125
121
128
Explanation - These are cubes of natural numbers: 1^3=1, 2^3=8, 3^3=27, 4^3=64, 5^3=125.
Correct answer is: 125
Q.17 Find the missing number: 2, 6, 18, 54, ?
108
162
150
196
Explanation - Each number is multiplied by 3: 2*3=6, 6*3=18, 18*3=54, 54*3=162.
Correct answer is: 162
Q.18 Find the missing number: 5, 7, 11, 19, ?
31
35
27
33
Explanation - Pattern: add consecutive even numbers: 5+2=7, 7+4=11, 11+8=19, 19+16=35.
Correct answer is: 35
Q.19 Find the missing number: 1, 3, 7, 15, ?
30
31
32
33
Explanation - Pattern: multiply by 2 and subtract 1: 1*2-1=1 (skip), 1*2+1=3, 3*2+1=7, 7*2+1=15, 15*2+1=31.
Correct answer is: 31
Q.20 Find the missing number: 6, 12, 24, 48, ?
96
100
108
92
Explanation - Each number is multiplied by 2: 6*2=12, 12*2=24, 24*2=48, 48*2=96.
Correct answer is: 96
Q.21 Find the missing number: 1, 2, 4, 8, 16, ?
32
30
28
34
Explanation - Each number is multiplied by 2: 1*2=2, 2*2=4, 4*2=8, 8*2=16, 16*2=32.
Correct answer is: 32
Q.22 Find the missing number: 3, 5, 9, 17, ?
33
31
29
27
Explanation - Pattern: multiply by 2 and subtract 1: 3*2-1=5, 5*2-1=9, 9*2-1=17, 17*2-1=33.
Correct answer is: 33
Q.23 Find the missing number: 2, 5, 10, 17, 26, ?
35
37
38
39
Explanation - Pattern: add consecutive odd numbers starting from 3: 2+3=5, 5+5=10, 10+7=17, 17+9=26, 26+11=37.
Correct answer is: 37