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  1. (5.5)3 – (4.5)3 is equal to :
    1. 1
    2. 75
    3. 74.25
    4. 75.25
Correct Option: D

(5.5)3 – (4.5)3
= (5.5 – 4.5)3 + 3 × 5.5 × 4.5 (5.5 – 4.5)
= (1)3 + 74.25 (1)
= 1 + 74.25 = 75.25


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