Verbal Reasoning - Series Completion - Discussion
Discussion Forum : Series Completion - Section 3 (Q.No. 1)
Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
1.
121, 143, 165, 186, 209
Answer: Option
Explanation:
Each term in the series is obtained by adding 22 to the preceding term.
So, 186 is wrong and must be replaced by (165 + 22) i.e. 187.
Discussion:
3 comments Page 1 of 1.
Naresh said:
1 decade ago
121, 143, 165, 209 all divisble by 11. So the odd one is 186.
Shankar said:
1 decade ago
11*11=121.
11*13=143.
11*15=165.
11*17=187.
11*19=209.
So, 186 is wrong and must be replaced by (11*17) i.e. 187.
11*13=143.
11*15=165.
11*17=187.
11*19=209.
So, 186 is wrong and must be replaced by (11*17) i.e. 187.
Sumanth kvns said:
1 decade ago
(11*11) =121 =>diff with the given num is = 0.
(12*12) =144 =>diff with the given num is = 4^0.
(13*13) =169 =>diff with the given num is = 4^1.
(14*14) =196 =>diff with the given num is = 4^2 (where it is not matching).
Let's continue with the same power of 4 because its not matched with the previous one.
(15*15) =225 =>diff with the given num is = 4^2.
So, here 186 is not matching (i.e wrong num in the series).
(12*12) =144 =>diff with the given num is = 4^0.
(13*13) =169 =>diff with the given num is = 4^1.
(14*14) =196 =>diff with the given num is = 4^2 (where it is not matching).
Let's continue with the same power of 4 because its not matched with the previous one.
(15*15) =225 =>diff with the given num is = 4^2.
So, here 186 is not matching (i.e wrong num in the series).
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