Logical Reasoning
easyQ. No. 16550-find-the-missing-number-row-1-9-8-81-row-2-11-4-55-row-3-13-7
Find the missing number: Row 1: 9, 8, 81; Row 2: 11, 4, 55; Row 3: 13, 7, ?
Last Updated:
A105
B103
C104
D111
Correct Answer: 104Your Answer: C
Explanation
The same positional rule must explain every row. Here the rule is to multiply the numbers and add the first number. Verification of Row 1: (9 × 8) + 9 = 81, exactly matching the given result. Verification of Row 2: (11 × 4) + 11 = 55, again matching the stated result, so the rule is consistent rather than a guess. Apply it unchanged to Row 3: (13 × 7) + 13 = 104. Therefore the missing number is 104, which is option C. The other choices are incorrect: 105, 103 and 111 do not equal (13 × 7) + 13; each would break the rule already verified in both complete rows. A valid missing-number solution cannot switch operations only for the final row. Rechecking the first two examples and then independently recalculating the target row confirms the answer.
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Missing Number FAQs
Common questions and clear answers for this topic.
What is a Missing Number question in reasoning?
A Missing Number question presents related numbers in rows, columns or groups and hides one value. The solver identifies a single arithmetic rule that fits every complete example and applies it unchanged to calculate the missing value.
How do I solve Missing Number puzzles quickly?
Check simple addition, subtraction, multiplication and division first. Then test squares and mixed operations. Verify the proposed rule on every complete row before calculating the missing row, and finally eliminate options by exact arithmetic.
Which patterns are common in Missing Number questions?
Common patterns include sums, differences, products, squares, doubled totals, product plus or minus a number, and rules combining a product with the sum. The same positional operation must work in all given rows.