Practice Questions on Number System
Aptitude Questions and Answers

Difficult Number System Question - 16

Q16.

How many three digit numbers can be formed using the digits $1,2,3,4,5,6,7$ and $8$ without repeating the digits and such that the tens digit is greater than the hundreds digit and less than the units digit?

A.

48

B.

56

C.

64

D.

72

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Difficult Number System Question - 17

Q17.

Find the sun of the digits of the least natural number $P$, such that the sum of the cubes of the four smallest distinct divisors of $P$ equals $2P$.

A.

7

B.

8

C.

9

D.

10

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Difficult Number System Question - 18

Q18.

If $n = 1 + x$, where $x$ is a product of four consecutive positive integers, then which of the following is true?

A. $n$ is odd

B. $n$ is prime

C. $n$ is a perfect square

A.

A and C only

B.

A and B only

C.

A only

D.

None of these

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Difficult Number System Question - 19

Q19.

The H.C.F of two numbers, each having three digits, is 17 and their L.C.M. is 714. The sum of the numbers will be:

A.

119

B.

221

C.

237

D.

727

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