Test Index

Series and Odd Man out Practice Test 1

Question : 11 of 40

Marks: +1, -0

42, 82, 163, 322, 642, 1282

Solution:

Concept:

The terms follow the rule: multiply by

2

and subtract

2

Explanation:

Compare each term with twice the previous term minus

2

42 \times 2 - 2 = 84 - 2 = 82

82 \times 2 - 2 = 164 - 2 = 162

But the series shows

163

in this place, so it is incorrect.

Using the correct value, the sequence should be

42, 82, 162, 322, 642, 1282

Check the remaining terms:

162 \times 2 - 2 = 324 - 2 = 322

322 \times 2 - 2 = 644 - 2 = 642

642 \times 2 - 2 = 1284 - 2 = 1282

Only

163

breaks the pattern; it must be replaced by

162

Answer:

The odd term is

163

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