Jake, Lena, Fred, and Inna need to drive home from a corporate reception in an SUV that can seat 7 people. If only Inna or Jake can drive, how many seat allocations are possible?
Select the correct option
A) 30 B) 42 C) 120 D) 240 E) 960
4 people ,7 seats, only 2 can drive   if inna is in one seat remaining, 3 people can be arranged in 3p3 i.e 3! =6 ways   since any one can drive total ways = 6 *2= 
<gadget id="calculator">6 *2</gadget>
<output>12</output>
12 ways   4 seats can be chosen out of remaining 6 seats in 6c3 ways= 6!/(3!*2!)= 20 ways     12*20= 
<gadget id="calculator">  12*20</gadget>
<output>240</output>
240   240
<result>D</result>
Jake, Lena, Fred, and Inna need to drive home from a corporate reception in an SUV that can seat 7 people. If only Inna or Jake can drive, how many seat allocations are possible?