self Maths Puzzle

what is the largest number you can write with the following Roman numerals?
I C X V L
You can use each numeral only once.

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self Other Question

a^2+b^2+c^2+d^2=85^2

then find out a,b,c,d
Compute: (100-1)(100-2)(100-3)....(100+1)(100+2)(100+3)=?