7, 8, 18, 57, 228, 1165, 6996
8
18
57
228
1165
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Answer : Option A
Explanation :
Let the given numbers be A, B, C, D, E, F, G.
Then, A, A x 1 + 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers.
Clearly, 228 is wrong.
190, 166, 145, 128, 112, 100, 91
100
166
145
128
112
Answer : Option D
Go on subtracting 24, 21, 18, 15, 12, 9 from the numbers to get the next number.
190 - 24 = 166 166 - 21 = 145 145 - 18 = 127 [Here, 128 is placed instead of 127] 127 - 15 = 112 112 - 12 = 100 ... and so on.
Therefore, 128 is wrong.
1, 1, 2, 6, 24, 96, 720
720
96
24
6
2
Answer : Option B
Go on multiplying with 1, 2, 3, 4, 5, 6 to get next number.
So, 96 is wrong.
196, 169, 144, 121, 100, 80, 64
169
144
121
80
Answer : Option E
Numbers must be (14)2, (13)2, (12)2, (11)2, (10)2, (9)2, (8)2.
So, 80 is wrong.
445, 221, 109, 46, 25, 11, 4
221
109
46
25
11
Answer : Option C
Go on subtracting 3 and dividing the result by 2 to obtain the next number.
Clearly, 46 is wrong.
19, 26, 33, 46, 59, 74, 91
26
33
59
74
Go on adding 7, 9, 11, 13, 15, 17 respectively to obtain the next number.
So, 33 is wrong. It must be 35
1, 3, 10, 21, 64, 129, 356, 777
10
21
64
129
356
A x 2 + 1, B x 3 + 1, C x 2 + 1, D x 3 + 1 and so on.
So, 356 is wrong.
6, 12, 48, 100, 384, 768, 3072
768
384
48
12
Each even term of the series is obtained by multiplying the previous term by 2.
2nd term = (1st term) x 2 = 6 x 2 = 12
4th term = (3rd term) x 2 = 48 x 2 = 96.
6th term = (5th term) x 2 = 384 x 2 =768.
4th term should be 96 instead of 100.
40960, 10240, 2560, 640, 200, 40, 10
640
40
200
2560
10240
Go on dividing by 4 to get the next number.
So, 200 is wrong.
3, 7, 15, 39, 63, 127, 255, 511
7
15
39
63
127
Go on multiplying 2 and adding 1 to get the next number.
So, 39 is wrong.
64, 71, 80, 91, 104, 119, 135, 155
71
104
119
135
No answer description available for this question. Let us discuss
15, 16, 34, 105, 424, 2124, 12756
16
34
105
424
2124
2nd term = (1st term) x 1 + 1 = 15 x 1 + 1 = 16.
3rd term = (2nd term) x 2 + 2 = 16 x 2 + 2 = 34.
4th term = (3th term) x 3 + 3 = 34 x 3 + 3 = 105.
5th term = (4th term) x 4 + 4 = 105 x 4 + 4 = 424
6th term = (5th term) x 5 + 5 = 424 x 5 + 5 = 2125
6th term should 2125 instead of 2124.
10, 26, 74, 218, 654, 1946, 5834
218
654
1946
2nd term = (1st term) x 3 - 4 = 10 x 3 - 4 = 26.
3rd term = (2nd term) x 3 - 4 = 26 x 3 - 4 = 74.
4th term = (3th term) x 3 - 4 = 74 x 3 - 4 = 218.
5th term = (4th term) x 3 - 4 = 218 x 3 - 4 = 650.
5th term must be 650 instead of 654.
2880, 480, 92, 24, 8, 4, 4
480
92
4
Go on dividing by 6, 5, 4, 3, 2, 1 respectively to obtain the next number.
Clearly, 92 is wrong.
3, 7, 15, 27, 63, 127, 255
27
Go on multiplying the number by 2 and adding 1 to it to get the next number.
So, 27 is wrong.
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4th term should be 96 instead of 100.