Quiz Discussion

$\frac{1}{{1 + {2^{a - b}}}} + \frac{1}{{1 + {2^{b - a}}}}$     is equal to = ?

• 1] a - b
• 2] b - a
• 3] 1
• 4] 0

(4 / 5) × ? × (3 / 7) = (16 / 105)

• 1]

  8/9

• 2]

  5/7

• 3]

  4/9

• 4]

  3/7

${ \text{If }}\left[ {4 - \frac{5}{{1 + \frac{1}{{3 + \frac{1}{{2 + \frac{1}{4}}}}}}}} \right]$  $x = {-b \pm \sqrt{b^2-4ac} \over 2a}$

• 1] 40 minutes
• 2] 45 minutes
• 3] 48 minutes
• 4] 36 minutes

The number of pairs of natural numbers the difference of whose squares is 45 will be ?

• 1] 2
• 2] 3
• 3] 6
• 4] 5

$\frac{3}{7}{ \text{of }} 455 + \frac{5}{8}{ \text{of}}456 = ?$

• 1] 448
• 2] 464
• 3] 476
• 4] 480
• 5] None of these