other Exam Numerical Ability

using the digits 1,4,7 exactly once and as many zeroes as you want,you may form a number.What is the difference between the smallest and largest remainder that can be obtained when the number is divided by 11

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other Other Question

the number of digits in 2^64 is find the remainder when 0^1+1^2+2^3+3^4................19^20 is divided by 11