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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