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  1. The cube of 997 is :
    1. 991026973
    2. 991029673
    3. 991029773
    4. 991097273
Correct Option: A

(997)3 = (1000 – 3)3
= (1000)3 – (3)3 – 3 × 1000 × 3 (1000 – 3)
= 1000000000 – 27 – 9000 × 997
= 1000000000 – 27 – 8973000
= 991026973


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