1) 728 is the sum of the first six terms of which of the following sequences?
a) 5, 10, 20, 40,...
b) 4, 8, 16, 32,...
c) 6, 12, 24, 48,...
d) 2, 6, 18, 54,...
2) Find the value of n, if a = 10, d = 5, an = 95
a) 16
b) 18
c) 20
d) 22
3) Find the 20th term for the given arithmetic progression: 3, 5, 7, 9,...
a) 41
b) 43
c) 45
d) 47
4) If the first term is 9 and the common ratio of a geometric progression is 3, then the first five terms are:
a) 27, 81, 243, 729, 2187
b) 1, 9, 27, 81, 243
c) 27, 81, 250, 730, 2190
d) 9, 27, 81, 243, 729
5) Find the first six terms of the sequence defined by the following recurrence relation: an = an-2 + 3an-1, with the initial conditions a0 = 8 and a1 = 2.
a) 13, 41, 136, 449, 1483, 4898
b) 2, 8, 13, 41, 136, 449
c) 8, 2, 13, 41, 136, 449
d) 2, 8, 26, 32, 110, 206
e) None of them