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181. One term in the number series is wrong. Find out the wrong term.
6, 15, 35, 77, 165, 221
(3 x 5), (5 x 7), (7 x 11),.....
So, 165 is wrong and must be replaced by (11 x 13) i.e. 143.
6, 15, 35, 77, 165, 221
Solution:
The terms of the series are products of two consecutive prime numbers i.e. (2 x 3),(3 x 5), (5 x 7), (7 x 11),.....
So, 165 is wrong and must be replaced by (11 x 13) i.e. 143.
182. One term in the number series is wrong. Find out the wrong term.
8, 13, 21, 32, 47, 63, 83
So, 47 is wrong and must be replaced by (32 + 14) i.e. 46.
8, 13, 21, 32, 47, 63, 83
Solution:
The correct pattern is + 5, + 8, + 11, + 14,.....So, 47 is wrong and must be replaced by (32 + 14) i.e. 46.
183. One term in the number series is wrong. Find out the wrong term.
1, 2, 4, 8, 16, 32, 64, 96
So, 96 is wrong and must be replaced by (64 x 2) i.e. 128.
1, 2, 4, 8, 16, 32, 64, 96
Solution:
Each term of the series is obtained by multiplying the preceding term by 2.So, 96 is wrong and must be replaced by (64 x 2) i.e. 128.
184. One term in the number series is wrong. Find out the wrong term.
3, 4, 10, 32, 136, 685, 4116
So, 32 is wrong and must be replaced by (10 x 3 + 3) i.e. 33.
3, 4, 10, 32, 136, 685, 4116
Solution:
The correct pattern is x 1 + 1, x 2 + 2, x 3 + 3, x 4 + 4,.....So, 32 is wrong and must be replaced by (10 x 3 + 3) i.e. 33.
185. One term in the number series is wrong. Find out the wrong term.
105, 85, 60, 30, 0, - 45, - 90
So, 0 is wrong and must be replaced by (30 - 35) i.e. - 5.
105, 85, 60, 30, 0, - 45, - 90
Solution:
The correct pattern is - 20, - 25, - 30,.....So, 0 is wrong and must be replaced by (30 - 35) i.e. - 5.
186. One term in the number series is wrong. Find out the wrong term.
2, 5, 10, 17, 26, 37, 50, 64
2, 5, 10, 17, 26, 37, 50, 64
Solution:
The terms of the series are (12 + 1), (22 + 1), (32 + 1), (42 + 1), (52 + 1), (62 + 1),(72+1),.....
So, 64 is wrong and must be replaced by (82 + 1) i.e. 65.
187. One term in the number series is wrong. Find out the wrong term.
125, 126, 124, 127, 123, 129
So, 129 is wrong and must be replaced by (123 + 5) i.e. 128.
125, 126, 124, 127, 123, 129
Solution:
The correct pattern is + 1, - 2, + 3, - 4, + 5.So, 129 is wrong and must be replaced by (123 + 5) i.e. 128.
188. One term in the number series is wrong. Find out the wrong term.
2, 5, 10, 50, 500, 5000
So, 5000 is wrong and must be replaced by (50 x 500) i.e. 25000.
2, 5, 10, 50, 500, 5000
Solution:
Each term of the series is the product of the preceding two terms.So, 5000 is wrong and must be replaced by (50 x 500) i.e. 25000.
189. One term in the number series is wrong. Find out the wrong term.
1, 3, 12, 25, 48
So, 25 is wrong and must be replaced by (62 - 32) i.e. 27.
1, 3, 12, 25, 48
Solution:
The terms of the series are (l2 - 02), (22 - l2), (42 - 22), (62 - 32) and (82 - 42).So, 25 is wrong and must be replaced by (62 - 32) i.e. 27.
190. One term in the number series is wrong. Find out the wrong term.
15, 16, 22, 29, 45, 70
So, 22 is wrong and must be replaced by (16 + 4) i.e. 20.
15, 16, 22, 29, 45, 70
Solution:
The correct pattern is + 1, + 4, + 9, + 16, + 25 i.e. + 12, + 22, + 32, + 42, + 52.So, 22 is wrong and must be replaced by (16 + 4) i.e. 20.