Quiz Discussion

The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is:

• 1]

  3/5

• 2]

  3/10

• 3]

  4/5

• 4]

  4/3

If (64)² - (36)² = 20 x a, then a = ?

• 1]

  115

• 2]

  140

• 3]

  132

• 4]

  176

The sum of first five prime numbers is:

• 1]

  11

• 2]

  18

• 3]

  26

• 4]

  28

(1000)^9 / 10^24 =

• 1] 10
• 2] 100
• 3] 1000
• 4] 10000

• 1] 1951609
• 2] 1981709
• 3] 18362619
• 4] 2031719

The largest 4 digit number exactly divisible by 88 is:

• 1] 8888
• 2] 9944
• 3] 9768
• 4] 8888

If n is a natural number, then (6n² + 6n) is always divisible by:

• 1]

  6 only

• 2]

  12 only

• 3]

  6 and 12 both

• 4]

  by 18 only

The smallest value of n, for which 2n+1 is not a prime number, is

• 1]

  3

• 2]

  4

• 3]

  5

• 4]

  6

What should be the maximum value of Q in the following equation?
5P9 – 7Q2 + 9R6 = 823

• 1]

  6

• 2]

  7

• 3]

  8

• 4]

  9

72519 X 9999

• 1] 725117481
• 2] 834782931
• 3] 747829383
• 4] 648392011