1.

Find the cube of 27.1. 189932. 196833. 195434. 198835. None of these.

Answer» Correct Answer - Option 2 : 19683

Concept used:-

Trick for writing cube of a number.

Method & Calculation:-

  • Write the cube of 2 & 7 in three digit form i.e. (008343
  • Now multiply all the digits within themselves i.e. (7 x 2) = 14
  • Now multiply the result obtained from step (2) by 3. i.e. 14 x 3 = 42
  • Now multiply 42 and 27 i.e. 42 x 27 = 1134
  • Now keep the unit digit vacant and add 008343 & 1134 i.e. 008343 + 1134_ = 19683


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