Question

Find the cube of 27.
1. 18993
2. 19683
3. 19543
4. 19883
5. None of these.

Answer 1

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