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

• 1] 2
• 2] 3
• 3] 6
• 4] 5

If $\frac{{x + 1}}{{x - 1}}{ \text{ = }}\frac{a}{b}$    and $\frac{{1 - y}}{{1 + y}}{ \text{ = }}\frac{b}{a}{ \text{,}}$ then the value of $\frac{{x - y}}{{1 + xy}}$   = ?

• 1]

  $\frac{{2ab}}{{{a^2} - {b^2}}}$

• 2]

  $\frac{{{a^2} - {b^2}}}{{2ab}}$

• 3]

  $\frac{{{a^2} + {b^2}}}{{2ab}}$

• 4]

  $\frac{{{a^2} - {b^2}}}{{ab}}$

Solve 4376 + 3209 - 1784 + 97 = 3125 + ?

• 1] 2713
• 2] 2743
• 3] 2773
• 4] 2793
• 5] 2737

Find the value of $\sqrt {4 + \sqrt {44 + \sqrt {10000} } }$

• 1] 12
• 2] 8
• 3] 4
• 4] -4

$\sqrt {0.00060516}$     is equal to = ?

• 1] 0.0246
• 2] 0.00246
• 3] 0.246
• 4] 0.000246