Problem Solving (PS) | Re: Which of the following is NOT a factor of 20!?

I think answer is E
1.29
There is no 29 in 20!. So it is not a factor
2.85
85 can be written as 5*17. Both numbers can be found in 20!.So it is a factor
3.121
121 =11*11. There is only one 11 in 20! So it is not a factor of 20!

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