Which of the following is/are cube(s) of even number (i) 249 (ii) 50653

None (If there are just these two options i.e, 249 and 50653. I think there are more options, anyway)

Step-by-step explanation:

Cubes of even numbers are even and cube of odd numbers are odd.

Since both the numbers are odd, both of their cubes must be odd too.

Thank You

Hope this helps you

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Step-by-step explanation:

15) n - 13

16) 3n

17) 12x - 9

18) -k

19) -20n

20) -4n

21) 3 - 21m

22) 16n + 18