In each of the following questions, one term in the number series is wrong. Find the wrong term
125, 126, 124, 127, 123, 129
Answer: E
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10, 26, 74, 218, 654, 1946, 5834
Answer: D
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1, 2, 6, 15, 31, 56, 91
Answer: D
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3, 7, 15, 39, 63, 127, 255, 511
Answer: A
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56, 72, 90, 110, 132, 150
Answer: E
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In each of the following questions, a number series is given with one term missing. Choose the correct alternative that will continue the same pattern.
1, 4, 9, 16, 25, ?
Answer: B
The numbers are \({1^2} , {2^2}, {3^2} , {4^2} , {5^2} \)
So the missing number is \({6^2} = 36.\)
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2, 3, 5, 7, 11, ?, 17
Answer: B
The given series consists of prime numbers starting from 2. The prime number after 11 is 13.
\(\therefore\) the missing number is 13
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2, 5, 9, ?, 20, 27
Answer: A
The pattern is +3, +4,...
\(\therefore\) Missing number = 9 + 5 =14
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20, 19, 17, ?, 10, 5
Answer: D
The pattern is -1, -2, ...
So the missing nimber is \(17-3=14\)
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77, 49, 36, 18, ?
Answer: D
Each number in the series is the product of the digits of the preceding number
Thus, \(7 \times 7 =49, 4\times9=36,..\)
\(\therefore\) The missing number \(= 1\times8=8\)
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