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# Series Completion

##### Direction for [ Question No: 1 To 5 ] :

In each of the following questions, one term in the number series is wrong. Find the wrong term

1.

125, 126, 124, 127, 123, 129

Answer: E

No answer description available for this question.

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2.

10, 26, 74, 218, 654, 1946, 5834

Answer: D

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3.

1, 2, 6, 15, 31, 56, 91

Answer: D

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4.

3, 7, 15, 39, 63, 127, 255, 511

Answer: A

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5.

56, 72, 90, 110, 132, 150

Answer: E

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##### Direction for [ Question No: 6 To 10 ] :

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.

6.

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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7.

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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8.

2, 5, 9, ?, 20, 27

Answer: A

The pattern is +3, +4,...
$$\therefore$$ Missing number = 9 + 5 =14

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9.

20, 19, 17, ?, 10, 5

Answer: D

The pattern is -1, -2, ...
So the missing nimber is $$17-3=14$$

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10.

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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