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  1. The value of  3√
    0.2 × 0.2 × 0.2 + 0.4 × 0.4 × 0.4
    		 is
    0.4 × 0.4 × 0.4 + 0.8 × 0.8 × 0.8
    1. 0.5
    2. 0.25
    3. 0.75
    4. 0.125
Correct Option: A

Let 0.2 = a and 0.04 = b
⇒  0.4 = 2a and 0.08 = 2b

∴  Expression = 3√
a × a × a + b × b × b
2a × 2a × 2a + 2b × 2b × 2b

= 3√
a3 + b3
8a3 + 8b3

= 3√
1
8

=
1
 = 0.5
2


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