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No even number gose in 21. In fact there is none that goes in 21, either.
21 is an odd composite number
an odd number
21+9=20
It is odd.
An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2. 21 is an odd number.
20 is even number.
because in a mean for 7 with three numbers the total of the 3 numbers must be 21 and (even number) + (even number) = (even number) 21 is odd Q.E.D
22.
Forty-two.
21 is the composite number because it's an odd number. 2 cannot be a composite number because it's even.
I would say 21, because it is not an even number like the rest are.