In the following question, select the number which can be placed at the sign of question mark (?) from the given alternatives.3 5 6 90 2 4 5 40 4 7 ? 140
5
The numbers are arranged in rows of four, and the last entry in each row must be produced from the first three by a single fixed rule.
Test the rule 'multiply the first three numbers' on Row 1: \(3\times5\times6=90\), which is exactly the fourth entry.
Confirm on Row 2: \(2\times4\times5=40\), again matching the fourth entry, so the rule is reliable.
Apply the same rule to Row 3, where the entries are 4, 7, ? and 140: \(4\times7\times?=140\).
First combine the known factors: \(4\times7=28\), so the equation becomes \(28\times?=140\).
Solve for the unknown: \(?=140\div28=5\).
The key concept is finding one consistent operation that reproduces the known results before using it to fill the gap.
Hence the number in place of the question mark is 5.
Similar Questions
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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
?
