Series
Question 1 |
What will be the next number?
3, 5, 7, 11, 13, 17β¦β¦.
21 | |
19 | |
25 | |
20 |
Discuss it
Question 1 Explanation:
This is a sequence of prime numbers
Question 2 |
Find wrong number in series:
12, 25, 49, 99, 187, 395, 789
12, 25, 49, 99, 187, 395, 789
789 | |
187 | |
99 | |
49 |
Discuss it
Question 2 Explanation:
12*2+1 =25
25*2-1 = 49
49*2+1 = 99
395*2-1 = 789
25*2-1 = 49
49*2+1 = 99
395*2-1 = 789
Question 3 |
Find wrong number in series:
34, 7, 37, 14, 36, 28, 43, 56
34, 7, 37, 14, 36, 28, 43, 56
14 | |
36 | |
28 | |
56 |
Discuss it
Question 3 Explanation:
mixture of series (alternate numbers)
34+3=37,
37+3 =40...
7*2= 14
14*2= 28
28*2 =56
34+3=37,
37+3 =40...
7*2= 14
14*2= 28
28*2 =56
Question 4 |
Find wrong number in series:
1, 4, 9, 16, 25, 32, 49, 64
1, 4, 9, 16, 25, 32, 49, 64
9 | |
25 | |
32 | |
64 |
Discuss it
Question 4 Explanation:
Square of natural numbers:
12=1, 22 =4, 32=9..............82=64
12=1, 22 =4, 32=9..............82=64
Question 5 |
Find wrong number in series:
2, 7, 10, 22, 18, 37, 26, 46
2, 7, 10, 22, 18, 37, 26, 46
10 | |
18 | |
26 | |
46 |
Discuss it
Question 5 Explanation:
two alternate series:
2+8 =10
7+15=22
10+8 =18
22+15=37
37+15 = 52
so, +8, +15, +8, +15, ......
2+8 =10
7+15=22
10+8 =18
22+15=37
37+15 = 52
so, +8, +15, +8, +15, ......
Question 6 |
Find wrong number in series:
4, 12, 48, 240, 1240, 10080
4, 12, 48, 240, 1240, 10080
12 | |
240 | |
1240 | |
10080 |
Discuss it
Question 6 Explanation:
4*3=12
12*4=48
48*5 = 240
240*6 = 1440
12*4=48
48*5 = 240
240*6 = 1440
Question 7 |
Find wrong number in series:
2, 3, 6, 0, 8, -3, 14, -6
2, 3, 6, 0, 8, -3, 14, -6
3 | |
0 | |
8 | |
3 |
Discuss it
Question 7 Explanation:
two alternate series:
2+4 =6,
3-3 =0
6+4 =10,
0-3 =-3
10+4 =14
-3-3 =-6
2+4 =6,
3-3 =0
6+4 =10,
0-3 =-3
10+4 =14
-3-3 =-6
Question 8 |
Find wrong number in series:
1, 8, 27, 64, 81, 216, 343
1, 8, 27, 64, 81, 216, 343
1 | |
27 | |
81 | |
343 |
Discuss it
Question 8 Explanation:
cubes of natural numbers
81 is not the cube of desired number
81 is not the cube of desired number
Question 9 |
Find wrong number in series:
4, 5, 7, 12, 19, 35
4, 5, 7, 12, 19, 35
12 | |
19 | |
35 |
Discuss it
Question 9 Explanation:
4+20=5
5+21=7
7+22=11
11+23=19
19+24=35
5+21=7
7+22=11
11+23=19
19+24=35
Question 10 |
Find wrong number in series:
23, 29, 31, 33, 41, 43, 47
23, 29, 31, 33, 41, 43, 47
29 | |
33 | |
41 | |
47 |
Discuss it
Question 10 Explanation:
prime numbers from 23
There are 18 questions to complete.