Number System

Number System
What is the sum of 1 + 2 + 3+ ... + 27 ?

382

343

396

378

382

343

396

378

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Number System
What is the sum of all the prime numbers from 20 to 40?

119

118

117

120

119

118

117

120

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Number System
A number consists of two digits whose sum is 8. If 18 is subtracted from the number, the place of digits get interchanged. Find the number.

32

35

53

46

32

35

53

46

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Number System
A basket contains 5 blue, 4 green and 3 red ball. If three balls are picked at random, what is the probability that at least one is red ?

31/58

37/52

34/55

32/51

31/58

37/52

34/55

32/51

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Number System
Difference between two numbers is 5, six times of the smaller lacks by 6 from the four times of the greater. Find the numbers?

10, 5

12, 7

12, 9

11, 6

10, 5

12, 7

12, 9

11, 6

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Number System
If 2^(2x-1) = 8^(3-x), then the value of x is:

2

5

6

9

2

5

6

9

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