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Maths Puzzle
Numerical Ability
which of the following is not a perfect square?
(A) 100856
(B) 325137
(C) 945729
(D) All of these
Read Solution (Total 4)
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- B)325137 alone
- 9 years agoHelpfull: Yes(0) No(2)
- b) 325137
Becaz A perfect square never ends with 7 - 9 years agoHelpfull: Yes(0) No(1)
- ans is D) All of these
- 9 years agoHelpfull: Yes(0) No(0)
- D. All of these.
At first, no perfect square ever ends with '7'. so option B is eliminated. Now how to find about the rest of the options ?
well, every perfect square will have exactly even number of all of its factors.
Statement 1: 100856
You can only factor it by 2 three times. This is not an even amount of 2s so it cannot be a perfect square.
Statement 3: 945729
You can factor 3 three times. This is not an even amount of 3s so it cannot be a perfect square
- 8 years agoHelpfull: Yes(0) No(0)
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