Yes.
The proper factors of 10 are 1, 2 & 5 with sum 1 + 2 + 5 = 8 which is less than 10, so 10 is deficient.
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55 is deficient.
NO- 24 is not deficient.
It's deficient
A deficient number is a number with its proper factors equalling a lower number than itself.
It is deficient.