1.

Find the cube of 19.1. 68592. 69493. 68394. 68895. None of these.

Answer» Correct Answer - Option 1 : 6859

Concept used:-

Trick for writing cube of a number.

Method & Calculation:-

  • Write the cube of 1 & 9 in three digit form i.e. (001729)
  • Now multiply all the digits within themselves i.e. (1 x 9) = 9
  • Now multiply the result obtained from step (2) by 3. i.e. 9 x 3 = 27
  •  Now multiply 27 and 19 i.e. 27 x 19 = 513
  • Now keep the unit digit vacant and add 001729 & 513 i.e. 001729 + 513_ = 6859


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