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NUMBER SYSTEM

Number System
In how many different ways can the letters of the word TEST' be arranged ?

16
12
8
10

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

The word TEST consists of 4 letters in which T comes twice ∴ Number of arrangements= 4!/2! = 4 x 3 x 2 x 1/2 x 1 = 12

Number System
What should come in place of the question mark (?) in the following number series ? 888 888 444 148 ? 7.4

37
35
33
29

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

888 ÷ 1 = 888888 ÷ 2 = 444444 ÷ 3 = 148148 ÷ 4 = 3737 ÷ 5 = 7.4

Number System
What is 846 times 323 ?

264258
293798
273258
283298

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

846 x 323 = 273258

Number System
The sum of the two digits of a two-digit number is 15 and the difference between the two digits of the two digit number is 3. What is the product of the two digits of the two digit number ?

14
36
None of these
54

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be 10 x + yWhere x > yAccording to the question,x + y = 15 and x - y = 3Solving both the equations,x = 9, y = 6∴ x x y = 9 x 6 = 54

Number System
When (21)² is subtracted from the square of a number the answer obtained is 1584. What is the number ?

55
45
65
35

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.According to the question,x² - (21)² = 1584= x² - 441 = 1584 = x² = 1584 + 441 = 2025∴ x = √2025 = 45

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