Class I

It is being given that (232 + 1) is completely divisible by a whole number. Which of the following numbers is completely divisible by this number?
  1. (216 + 1)
  2. (216 - 1)
  3. (7 x 223)
  4. (296 + 1)
The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is:
  1. 35
  2. 310
  3. 45
  4. 43
If (64)2 - (36)2 = 20 x x, then x = ?
  1. 140
  2. 180
  3. 54
  4. 45
72519 x 9999 = ?
  1. 725117481
  2. 674217481
  3. 685126481
  4. 696217481
The sum of first 45 natural numbers is:
  1. 1035
  2. 1280
  3. 2070
  4. 2140
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