If the sum of two numbers is 15 and their HCF and LCM are 3 and 18, respectively, then the sum of the reciprocals of the two numbers is:

1
\({{5} \over 18}\)
2
\({{2} \over 9}\)
3
\({{1} \over 9}\)
4
\({{1} \over 6}\)

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