In the following question, select the number which can be placed at the sign of question mark (?) from the given alternatives.6 5 ? 180 1 7 3 42 3 8 2 96
3
This is a matrix / number-analogy problem where the last entry of each row is produced from the other entries of that same row by a common rule.
The rows are \((6,\ 5,\ ?,\ 180)\), \((1,\ 7,\ 3,\ 42)\) and \((3,\ 8,\ 2,\ 96)\).
Test the rule “multiply the first three numbers, then double the product” using the two complete rows.
Row 2: \(1 \times 7 \times 3 = 21\), and \(21 \times 2 = 42\), which matches the last entry.
Row 3: \(3 \times 8 \times 2 = 48\), and \(48 \times 2 = 96\), which also matches, confirming the rule.
Apply it to Row 1: \(6 \times 5 \times ? \times 2 = 180\), i.e. \(60 \times ? = 180\).
Solving, \(? = 180 \div 60 = 3\).
The concept is spotting a uniform row operation and checking it on the known rows before using it. Hence the missing number is 3.
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Important Questions from Missing Number in Matrix
Select the missing number from the given responses:
1
216
343
8
125
512
27
64
?
35
401
1575
Following is a matrix of certain entries. The entries follow a certain trend row-wise. Choose the missing entry (?) accordingly.
7B 10A 3C 3C 9B 6A 10A 13C ? Study the given pattern carefully and select the number that can replace the question mark (?) in it.
116 160 ? 3 8 13 7 4 2 Find the missing number from the given responses in the following question.
9 6 8 5 8 4 7 4 ? 11 2 7 In the following question, from the given alternatives, select the number that comes in place of the question mark (?).
16
8
13
17
12
23
21
15
19
162
105
?
