1.

Find the cube of 98.1. 9411922. 9289923. 9146524. 9234825. None of these.

Answer» Correct Answer - Option 1 : 941192

Concept used:-

Cube of a number near to base of hundred or tens.

Method and Calculation:-

 • Represent the cube as addition or subtraction from base of hundred or ten.

983 = (100 - 2)3

 • Use identity (a - b)3 = a3 - b3 - 3ab (a - b)

(100 - 2)3 = 1003 - 23 - 3 × 100 × 2 (100 - 2)

 (100 - 2)3 = 1000000 - 8 - 600 × 98 = 999992 - 58800 = 941192


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