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  1. The cube of 105 is
    1. 1157625
    2. 1175625
    3. 1185625
    4. 1158625
Correct Option: D

(105)3 = (100 + 5)3
= (100)3 + (5)3 + 3 × 100 × 5 (100 + 5)
[∵  (a + b)3 = a3 + b3 + 3ab (a + b)]
= 1000000 + 125 + 1500 × 105
= 1000000 + 125 + 157500
= 1157625


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