48 is not a multiple of:
4
12
18
16
48 can also be written as,
48=1×4848=2×2448=3×1648=4×1248=6×8
So, the factors of 48 are: 1,2,3,4,6,8,12,16,24,and48
18is not a factor of 48
Hence, option (C) is correct answer.
Find a proper positive factor of 48 and a proper positive multiple of 48 which add up to a perfect square. Can you prove that there are infinitely many such pairs?