1.

Find the cube of 39.1. 587292. 593193. 576894. 584495. None of these.

Answer» Correct Answer - Option 2 : 59319

Concept used:-

Trick for writing cube of a number.

Method & Calculation:-

  • Write the cube of 3 & 9 in three digit form i.e. (027729)
  • Now multiply all the digits within themselves i.e. (3 x 9) = 27
  • Now multiply the result obtained from step (2) by 3. i.e. 27 x 3 = 81
  • Now multiply 81 and 39 i.e. 81 x 39 = 3159
  • Now keep the unit digit vacant and add 027729 & 3159 i.e. 027729 + 3159_ = 59319


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