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CanadaON
Grade 11

Recursion for Geometric Sequences

Interactive practice questions

Consider the first-order recurrence relationship defined by $T_n=2T_{n-1},T_1=2$Tn=2Tn1,T1=2.

a

Determine the next three terms of the sequence from $T_2$T2 to $T_4$T4.

Write all three terms on the same line, separated by commas.

b

Plot the first four terms on the graph below.

Loading Graph...
c

Is the sequence generated from this definition arithmetic or geometric?

Arithmetic

A

Geometric

B

Neither

C
Easy
2min

Consider the sequence plot drawn below.

Easy
1min

Consider the sequence $9000,1800,360,72,\dots$9000,1800,360,72,

Write a recursive rule for $T_n$Tn in terms of $T_{n-1}$Tn1 and an initial condition for $T_1$T1.

Write both parts on the same line separated by a comma.

Easy
1min

Consider the sequence $40$40, $20$20, $10$10, $5$5, $\text{. . .}$. . .

Easy
1min
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Outcomes

11U.C.1.2

Determine and describe a recursive procedure for generating a sequence, given the initial terms and represent sequences as discrete functions in a variety of ways

11U.C.1.4

Represent a sequence algebraically using a recursion formula, function notation, or the formula for the nth term and describe the information that can be obtained by inspecting each representation

11U.C.2.2

Determine the formula for the general term of an arithmetic sequence [i.e., t_n = a + (n –1)d ] or geometric sequence (i.e., tn = a x r^(n – 1)), through investigation using a variety of tools and strategies and apply the formula to calculate any term in a sequence

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