We need to find which of the expressions does not have a two digit quotient.
The only expression which does not have a two digit quotient is \(\dfrac{915}{7}\).
Let us check each expression
\(\dfrac{519}{6}\)
Dividing each by three
\(\dfrac{173}{2}=86.5\)
So, the quotient is betweem 86 and 87.
\(\dfrac{915}{7}\)
\(7\times 130=910\)
\(7\times 131=917\)
So, the quotient will lie between 130 and 131.
\(\dfrac{439}{7}\)
\(7\times 62=434\)
\(7\times 63=441\)
So, the quotient will lie between 62 and 63.
\(\dfrac{812}{9}\)
\(9\times 90=810\)
\(9\times 91=819\)
So, the quotient will lie between 90 and 91.
Hence, the only expression which does not have a two digit quotient is \(\dfrac{915}{7}\).
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