A can do a certain piece of work in 8 days, B can do the same work in 18 days and C can do the same work in 12 days. Find the number of days it will take to complete the same work, if they all work together.
\( \frac{19}{48} \)
\( \frac{72}{19} \)
\( \frac{48}{19} \)
\( \frac{19}{72} \)
Select the correct homologous series of alkanes.
CH4, C2H6, C3H8, C4H10
CH4, C2H4, C3H8, C4H10
CH4, C3H8, C2H6, C4H10
CH4, C2H4, C3H4, C4H10