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Number System

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

None
2
6
4

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
(12.11)2 + (?)2 = 732.2921

17.2
14.2
20.2
24.2

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

24.2

Number System
If A + B = 30 and AB = 94, What is the value of A² + B² ?

824
920
712
625

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

(A + B)² = (30)² = 900A² + B² + 2AB = 900Therefore, A² + B² = 900 - 2 x 94                                = 900 - 188 = 712

Number System
The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is:

20
None of these
40
30

ANSWER DOWNLOAD EXAMIANS APP

Number System
Which one of the following represents the sum of the first n even numbers?

N(N – 1)
N(N + 1)
N2+ 1
N2

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

N (N + 1)

Number System
Pick the wrong number from the given number series. 3,4,10,33,135,685,4116

33
10
685
135

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

The correct number is 136.3 x 1 + 1 = 44 x 2 + 2 = 1010 x 3 + 3 = 3333 x 4 + 4 = 136136 x 5 + 5 = 685685 x 6 + 6 = 4116

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