Sequences — Quiz 2

Questions in this quiz (5)

1. Which term of the arithmetic sequence $$5,9,13,17,\ldots$$ is $$409$$?

   • $$99^{\text{th}}$$
   • $$102^{\text{nd}}$$
   • $$111^{\text{th}}$$
   • $$100^{\text{th}}$$

2. If $$a_n$$ is an arithmetic sequence, $$a_1=-3$$ and $$a_5=5$$, find $$a_{10}$$.

   • 14
   • 16
   • 17
   • 15

3. What is the arithmetic mean between 15 and 40?

   • $$27.5$$
   • $$25$$
   • $$29$$
   • $$28.5$$

4. Determine which of the following is not an arithmetic sequence.

   • $$-1,5,11,17,\ldots$$
   • $$20,23,26,29,\ldots$$
   • $$\frac{1}{2},\frac{1}{3},\frac{1}{4},\frac{1}{5},\ldots$$
   • $$\frac{1}{3},1,\frac{5}{3},\frac{7}{3},\ldots$$

5. Write first four terms of the arithmetic progression when the first term $$a = -2$$ and the common difference $$d = 0$$.

   • $$-2, 0, 2, 4$$
   • $$-2, 4, -8, 16$$
   • $$-2, -4, -8, -16$$
   • $$-2, -2, -2, -2$$