FPSC · Other · N/A
Solved odd one out numbers MCQs — 6 questions on finding the number that is different, by digit sums, squares, primes and divisibility, with verified answers and explanations. Free online practice for FPSC, PPSC, NTS and all one-paper exams. Covers odd one out numbers.
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Questions
6
Time
6
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Subjects
1
Topics
1
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About this paper
This is the General Ability: Odd One - Numbers solved MCQ bank from Advanced FPSC & Other Federal Model Papers (Edition 32): 6 published questions (book p. 785, all 6 printed) on finding the number that is different from the other three, covering digit-count, digit-sum, square, prime and divisibility rules. Every answer was re-solved from scratch against the printed Answer Key, and every question carries a worked explanation.
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Subject 1
Topic Section
6 solved MCQs shown directly below
Correct Answer: 62
340, 213 and 122 are three-digit numbers, while 62 is the only two-digit number in the group, so 62 is the odd one out. Its digit sum 8 also breaks the 7, 6, 5 run of the other three.
Correct Answer: 256
The digit sums of 121, 196 and 216 are 4, 16 and 9, all perfect squares, while the digit sum of 256 is 13, which is not a perfect square, so 256 is the odd one out.
Correct Answer: 64
54, 174 and 294 are all divisible by 6 and rise by 120 at each step, while 64 is not divisible by 3, so 64 is the odd one out.
Correct Answer: 196
144, 225 and 324 all have digit sum 9, while 196 has digit sum 16, so 196 is the odd one out. Their square roots 12, 15 and 18 are also multiples of 3, while 14 is not.
Correct Answer: 71
71 is a prime number, while 81 = 9 x 9, 91 = 7 x 13 and 121 = 11 x 11 are all composite, so 71 is the odd one out.
Correct Answer: 368
654, 582 and 429 all have digit sum 15, while 368 has digit sum 17, so 368 is the odd one out.
Source & verification
Built by GK360 from verified bank questions — every answer rechecked before publishing.
Questions
6 questions, all 6 printed in the book. No item was dropped: every keyed answer was verified by re-solving.
Finding the number that differs from the other three: by digit count, by digit sum (including digit sums that are perfect squares), by primality, and by divisibility and step patterns.
Yes. Every published answer was re-solved from scratch and checked against the book's printed Answer Key at the top right of p. 785; all 6 published answers agree with the key. Two items carry retained notes rather than overrides: in Q42 the keyed digit-sum rule (121, 196 and 216 have square digit sums 4, 16 and 9; 256 has 13) competes with a square-vs-cube reading under which 216, the only perfect cube, would be the odd one out; and in Q46 the keyed digit-sum rule (654, 582 and 429 all sum to 15; 368 sums to 17) competes with a parity reading under which 429, the only odd number, would be the odd one out. Both published answers follow the printed key.
Odd-one-out number questions of this form appear in FPSC, PPSC, NTS, OTS and other one-paper exams, as well as CSS MPT-style quantitative sections, so the bank is tagged for all of them.
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