Consider the set A of natural numbers n whose units digit is nonzero, such that if this units digit is erased, then the resulting number divides n. If
Consider the set A of natural numbers n whose units digit is nonzero, such that if this units digit is erased, then the resulting number divides n. If K is the number of elements in the set A, then
A. K is infinite
B. `"K is finite but " K gt 100`
C. `25leKle100`
D. `Klt25`
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Correct Answer - D
Such numbers are =9 from 11 to 19
4 i.e. (22,24,26,28)
3 i.e. (33,36,39)
2 i.e. (44,48)
5 i.e. (55,66,77,88,99,)
`bar(23)`
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