Select the option for ? That continue the pattern?

1). 7,16,12, 4, 20, ?

27. 10. 40. 37.

2). 2, 7, 26, 101,400,?
1595. 800. 695. 1840

3). 7, 21, 8. 72, 9,?
81. 243. 123. 136