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Number System

Number System
If 272/3 × 81-1/2 = 3x, the value of x is

2
1
3
0

ANSWER DOWNLOAD EXAMIANS APP

Number System
An urn contains 9 blue, 7 white and 4 black balls. If 2 balls are drawn at random, then what is the probability that only one ball is white ?

90/190
92/190
89/190
91/190

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Total possible outcomes = 20C2 = 20 x 19/1 x 2 = 190Total favourable outcomes = 7C1 x 13C1 = 7 x 13 = 91∴ Required probability = 91/190

Number System
In a division sum, the divisor is 10 times the quotient and 5 times the remainder. If the remainder is 46, the dividend is:

9865
2568
5336
6890

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

5336

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

3326400
1326400
None of these
2326400

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

CORPORATION = 11 letters 'O' comes thrice,'R' twice.∴ total no. of ways = 111/3121 = 3326400

Number System
A number when multiplied by five times of itself give the value equal to 1445. What is the number ?

15
18
16
17

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x x 5x = 1445= 5x² = 1445= x² = 289∴ x = 17

Number System
If one-third of one fourth of a number is 15, then three-tenth of that number is:

35
54
25
45

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x. Then,1/3 of 1/4 of x = 15x = 15 * 12 = 180So, required number = (3/10 * 180) = 54.

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