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Insert four H.M.s between 2/3 and 2/13....

Insert four H.M.s between 2/3 and 2/13.

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`d=(13/2-3/2)/5=1`
`therefore1/(H_(1))=3/2+1=5/2` or `H_(1)=2/5`
`1/H_(2)=3/2+2=7/2orH_(2)=2/7`
`1/H_(3)=3/2+3=9/2` or `H_(3)=2/9`
`1/H_(4)=3/2+4=11/2` or `H_(4)=2/11`
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