Several terms of a sequence can't e, are given below. {1, - 7, 49, - 343, 2401, ..} a. Find the next two terms of the sequence. b. Find a recurrence relation that generates the sequence (supply the initial value of the index and the first term of the sequence). c. Find an explicit formula for the general nth term of the sequence. a. The next two terms of the sequence are a; = and a7 = . (Simplify your answers.) b. Choose the correct answer below. O A. an+ 1 = an - 7, a, = 1, for n 2 1 an O B. an + 1= 7, a1 = 1, for n 2 1 O C. an+ 1= an +7, a, = 1, for n > 1 O D. an+ 1= -7an, a, = 1, for n 2 1 c. The explicit formula for the general nth term of the sequence is a= n21