1) what is the common ratio in the sequence: 4, 12, 36, 108 a) 2 b) 3 c) 4 d) 5 2) The first term of a geometric sequence is 5, and the common ratio is 2. What is the 3rd term? a) 10 b) 15 c) 20 d) 40 3) which of the following is a geometric sequence? a) 2,4,6,8 b) 1,3,9,27 c) 5,10,15,20 d) 7,14,21,28 4) find the 4th term of the sequence where a¹ = 3 and r = 5   a) 15 b) 75 c) 375 d) 18 5) if the 1st term of a geometric sequence is 8 and the common ratio is ½, what is the 6th term? a) 0.5 b) 1 c) 2 d) 4 6) what is the sum of the first 3 terms of the geometric sequence: 2,6,18? a) 24 b) 26 c) 30 d) 32 7) in a geometric sequence, the 3rd term is 27, and the common ratio is 3 what is the 1st term? a) 3 b) 9 c) 1 d) 27 8) which formula represents the n-th term of a geometric sequence? a) a/n = a/1 + ( n- 1) d b) a/n = a/1 • r (n - 1) c) a/n = d • n d) a/n = a/1 + d • n 9) the 1st term of a geometric sequence is 10, and the common ratio is 0.5 what is the 5th term? a) 1.25 b) 2.5 c) 5 d) 10 10) what is the 2nd term of the geometric sequence where a/1 = 7 and r = 3? a) 21 b) 14 c) 28 d) 10 11) in a geometric sequence, if the 2nd term is 4 and the common ratio is 2, what is the 1st term? a) 2 b) 3 c) 1 d) 8 12) what is the 6th term of the geometric sequence: 1,2,4,8 a) 16 b) 32 c) 64 d) 128 13) if the 4th term of a geometric sequence is 64 and the common ratio is 2, what is the 1st term? a) 4 b) 8 c) 16 d) 32 14) Find the common ratio in the sequence: 1,5,25,125, a) 2 b) 3 c) 4 d) 5 15) the sum of the first 4 terms of a geometric sequence is 30. If the first term is 2, what is the common ratio a) 2 b) 3 c) 4 d) 5

GEOMETIC SEQUENCE QUIZ

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