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X is a 30 digit number starting with the digit 4 followed by the digit 7, then the number X^3 will have 

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X is a 30 digit number starting with the digit 4 followed by the digit 7, then the number X3 will have 

(A) 90 digits 

(B) 91 digits 

(C) 92 digits 

(D) 93 digits

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Best answer

Correct option is (A) 90 digits 

X = (47 ......) 30 digits

Suppose (47)3 30digits = (2 + 2 + 2) digits in (47)3

Similarly (47)3 30digits  = contains (30 + 30 + 30) digits = 90 digits.

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