to have remainder of 0 the Numberator MUST be a multiple of 10 like 10,20,30,40 etc.
1. if x=3n+2 then we know X follows pattern 2,5,8,11,14.
we find the pattern of 3 raised to power and it is 1,3,9,7,1,3 etc... notice that the only time we can get remainder 0 is when 3 is raised to a power and result in units digit of 9 since 9+1 =10. it is irrelevant the tens,hundreds etc. digits are for this problem.
so going back to the pattern 2,5,8,11,14. if you try first couple you see 3^2=9 which is good. but, 3^5 gets us 3 in the units digit which is no good. so 1 is INSUFF
2. this goes by same logic, since x >4 we will have unit digits of 9 and others so INSUFF.
combining them doesnt help either since it just makes the pattern start at 17. so INSUFF
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