Question

X is a 30 digit number starting with digit 4 and followed by digit 7 .Then the number x ^3 will have

Answer 1

Answer: 90 digits

Step-by-step explanation:

X = 4777....(till 30 digits)

or X = 4.7777⋯ ∗ 10^29

X^3 = (4.777⋯∗10^29 )^3

= (4.777…)^3 ∗ 10 ^87

So, (X)^3 will have 3 + 87 = 90 digits.