Study the given pattern carefully and select the number from among the given options that can replace the question mark (?) in it.
30 42 56
20 30 ?
12 14 16

This question was previously asked in
NTPC CBT-I (Held On: 5 Jan 2021 Shift 2)
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  1. 50
  2. 42
  3. 40
  4. 54

Answer (Detailed Solution Below)

Option 2 : 42
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Detailed Solution

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Logic: Column wise:

(1st number - 3rd number) + 2 = 2nd number

Column 1: (30 - 12) + 2 = 18 + 2 = 20;

Column 2: (42 - 14) + 2 = 28 + 2 = 30;

Similarly,

Column 3: (56 - 16) + 2 = 40 + 2 = 42.

Hence, 42 is the correct answer.

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