20
Q:

8, 15, 28, 53, ?, 199

A) 101 B) 102
C) 103 D) 104

Answer:   B) 102

Explanation:

Here the series of the form is \inline \fn_cm \times 2-1,\: \times 2-2,\: \times 2-3,\: \times 2-4,\: \times 2-5

\fn_cm \therefore \: 53\times 2-4=102

Q:

In the following sum, “?” stands for which digit ?


8 + ?8 + 28 + 83 + 8? = 2?8

A) 4 B) 3
C) 2 D) 1
 
Answer & Explanation Answer: D) 1

Explanation:

By trial and error method from the given options,

'1' satisfies the above given equation.

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1 73
Q:

Which digits will come in the place of '?' in the following series ?

372, 823, 644, 582, 46?, 8?7

A) 4, 4 B) 6, 2
C) 3, 2 D) 2, 5
 
Answer & Explanation Answer: B) 6, 2

Explanation:

Given series is 372, 823, 644, 582, 46?, 8?7

Here the series follow the rule that :
372 = 3+7+2 = 12
823 = 8+2+3 = 13
644 = 6+4+4 = 14
582 = 5+8+2 = 15
46? = 4+6+? = 16 => ? = 6
8?7 = 8+?+7 = 17 => ? = 2

So the missing numbers are 6 and 2

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3 59
Q:

Find the wrong number from the following series ?
37   47    52    67    87    112    142

A) 87 B) 47
C) 52 D) 67
 
Answer & Explanation Answer: B) 47

Explanation:

The given series follows the rule,
+(5x1), +(5x2), +(5x3), +(5x4), +(5x5),....

So starting from 37, 37 + 5 = 42, 42 + 10 = 52, 52 + 15 = 67, 67 + 20 = 87,...
So wrong number is 47 which is to be 42.

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4 60
Q:

Find the wrong number from the following series ?
7   18   40   106   183   282   403

A) 18 B) 183
C) 40 D) 106
 
Answer & Explanation Answer: C) 40

Explanation:

The given series follows the rule,
+(11x1), +(11x3), +(11x5), +(11x7), +(11x9),....

So starting from 7, 7 + 11 = 18, 18 + 33 = 51, 51 + 55 = 106, ...
So wrong number is 40 which is to be 51.

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3 47
Q:

What is the next number in series?

10, 9, 60, 90, 70, 66, ?

A) 73 B) 19
C) 96 D) 22
 
Answer & Explanation Answer: C) 96

Explanation:

ten = 3(number of letters)
nine = 4(number of letters)
sixty = 5(number of letters)
ninety = 6(number of letters)
seventy = 7(number of letters)
sixtysix = 8(number of letters)
ninetysix=96(number of letters)

Then, likwise choose the number which has 9 letters in its Spelling.

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4 121