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Number System

Number System
√343 = ?

19
21
20
18

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = √343 = 18

Number System
How many numbers between 300 and 800 can be by using digits 2, 4, 5, 6 and 0 ?

56
36
52
48

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

∴ Reqd . numbers = 3 x 4P2 = 3 x 12 = 36

Number System
Supply the missing figure : 2, 6, 12, 20, 30 ... 56

41
40
42
39

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

42

Number System
Sum of the digits number is 8 and their product is 12. Find the difference between the digits?

2
4
None
6

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x + y = 8xy = 12(x – y)2 = (x + y)2 – 4xy (x – y)2 = 64 – 48 => (x – y) = 4

Number System
A number consists of two digits. If the digits interchange places and the new number is added to the original number, then the resulting number will be divisible by:

9
11
5
3

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the ten's digit be x and unit's digit be y. Then, number 10x + y.Number obtained by interchanging the digits = 10y + x.(10x + y) + (10y + x) = 11(x + y)which is divisible by 11.

Number System
The product of two consecutive odd numbers is 6723. Find is the greater number.

80
83
77
85

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the first odd number be x.Then, the other odd number would be x + 2.∴ x(x+2) = 6723= x2 + 2x = 6723= x2 + 2x = 6723= x2 + 2x - 6723 = 0= x2 + 83 - 81 x - 6723 = 0= x(x+83) - 81 (x + 83) = 0= (x + 83) (x - 81) = 0= (x + 83) (x - 81) = 0= x - 81 = 0∴ x = 81Hence, greater number = x + 2 = 81 + 2 = 83

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