In the following question, select the missing number from the given series.

28, 30, 36, 48 ? 98, 140

• 68

• 65

• 72

• 67

A.

68

$$\begin{gathered} 28\stackrel{+2}{\to } 30 \stackrel{+6}{\to }36 \stackrel{+12}{\to }48\stackrel{+20}{\to }\boxed{68}\stackrel{+30}{\to }98\stackrel{+42}{\to }140 \\ \mathrm{Now}, \mathrm{Check} \mathrm{the} \mathrm{pattern} \mathrm{of} +2, +6, +12, +20, +30, +42 \\ \Rightarrow +2\stackrel{+4}{\to }+6\stackrel{+6}{\to }+12\stackrel{+8}{\to }20\stackrel{+10}{\to }30\stackrel{+12}{\to }42 \\ \mathrm{Now}, \mathrm{Check} \mathrm{the} \mathrm{pattern} \mathrm{of} +4, +6, +8, +10, +12 \\ \Rightarrow +4\stackrel{+2}{\to } + 6\stackrel{+2}{\to }8 \stackrel{+2}{\to }10\stackrel{+2}{\to }12 \end{gathered}$$