Directions (1-5): Find the Odd one
in the series
1.
4,
5, 15, 49, 201, 1011, 6073
(a) 5 (b) 15
(c) 49 (d) 201
2.
888,
440, 216, 104, 48, 22, 6
(a) 440 (b) 216
(c) 104 (d) 48
3.
2,
3, 6, 15, 52.5, 157.5, 630
(a) 3 (b)6
(c) 15 (d) 52.5
(e) 157.5
4.
5,
8, 20, 42, 124, 246, 736
(a) 8 (b) 20
(c) 42 (d) 124
(e) 246
5.
1050,
510, 242, 106, 46, 16, 3
(a) 510 (b) 242
(c) 106 (d) 46
(e) 16
Directions (6-10): Insert the missing
number
6.
9,
12, 11, 14, 13, ___, 15
(a) 12 (b) 16
(c) 10 (d) 17
7.
71,
76, 69, 74, 67, 72, ___
(a) 77 (b) 65
(c) 80 (d) 76
8.
10,
5, 13, 10, 16, 20, 19, ___
(a) 22 (b) 40
(c) 38 (d) 23
9.
7,
26, 63, 124, 215, 342, ___
(a) 481 (b) 511
(c) 391 (d) 421
10.
165,
195, 255, 285, 345, ___
(a) 375 (b) 420
(c) 435 (d) 390
Answers:
1
|
a
|
6
|
b
|
2
|
e
|
7
|
b
|
3
|
d
|
8
|
b
|
4
|
b
|
9
|
b
|
5
|
c
|
10
|
c
|
Solutions:
1.
2nd
term = (1st term *1+2)= (4*1+2) = 6
3rd term = (2nd
term*2+3) = (6*2+3) = 15
4th term = (3rd
term*3+4) = (15*3+4) = 49
5th term = (4th
term*4+5) = (49*4+5) = 210 and so on
Therefore 5 is wrong
2.
2nd
term = (1st term - 8)/2 = (888-8)/2 = 440
3rd term = (2st
term - 8)/2 = (440-8)/2 = 216
4rd term = (3st
term - 8)/2 = (216-8)/2 = 104
5rd term = (4st
term - 8)/2 = (104-8)/2 = 48
6rd term = (5st
term - 8)/2 = (48-8)/2 =20
Therefore 22 is wrong
3.
2nd
term = (1st term* 1.5) = 2 * 1.5 = 3
3rd term = (2st
term* 2) = 3* 2 = 6
4th term = (3st
term* 2.5) = 6 * 2.5 = 15
5th term = (4st
term* 3) = 15 * 3 = 45
Therefore 52.5 is wrong
4.
2nd
term = (1st term * 2 - 2) = (5 * 2 – 2) = 8
3rd term = (2st
term * 3 - 2 ) = (8* 3 – 2) = 22
4th term = (3st
term * 2 - 2 ) = (22 * 2 – 2) = 42
5th term = (4st
term * 3 - 3) = (42 * 3 – 2) = 124 and so on
Therefore 20 is wrong
5.
2nd
term = (1st term - 30)/2= (1050-30)/2= 510
3rd term = (2st
term - 26)/2= (510-26)/2= 242
4th term = (3st
term - 22)/2 = (242-22)/2 = 110
Therefore 106 is wrong
6.
Alternatively,
We add 3 and subtract 1
7.
Alternatively,
We add 5 and subtract 7
8.
There
are two series (10, 13, 16, 19) and (5, 10, 20, 40), one increasing by 3 and
the other multiplied by 2
9.
Numbers
are (23 - 1), (33 - 1), (44 - 1), (53
- 1) etc…… so, the next no. is (83 - 1) = 512- 1 = 511
10.
Each
number is 15 multiplied by a prime number i.e., 15 * 11, 15 * 13, 15 * 17, 15 *
19 and so on
So the next number is 15 * 29 = 435
published for Jobentra.blogspot.com
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