1.

Find the cube of 51.1. 1335212. 1338313. 1326514. 1299915. None of these.

Answer» Correct Answer - Option 3 : 132651

Concept used:-

Trick for writing cube of a number.

Method & Calculation:-

  • Write the cube of 5 & 1 in three digit form i.e. (125001)
  • Now multiply all the digits within themselves i.e. (5 x 1) = 5
  • Now multiply the result obtained from step (2) by 3 i.e. 5 x 3 = 15
  • Now multiply 15 and 51 i.e. 15 x 51 = 765
  • Now keep the unit digit vacant and add 125001 & 765 i.e. 125001 + 765_ = 132651


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