1.6 Series
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[ PURE 1 ] 1) Arithmetic Sequence 2) Geometric Sequence 3) Sum to Infinity
Last updated 11:34 AM on 10/9/25
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20 Terms
1
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What is an Arithmetic Sequence/Progression
Any sequence with a common difference (d) + or --
2
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What is a Geometric Sequence/Progression
Any sequence with a common ratio (r) \* or ÷
3
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What is “a”
First term
4
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What is “T1”
a (First term)
5
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What is “n”
n = no of term
6
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What is the formula of Tn (nth term/last term) in an AP
7
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Write the formula (AP)
8
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What is the first step in solving an AP question
Convert any and every term into “a”, first term, and “d”, common difference
9
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What is the formula of n (AP)
10
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What is Sn
Sum of n terms
11
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What is S1
T1 = a = first term
12
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What is the formula of Sn in an AP
13
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What is the formula
14
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What is the formula of Tn in an GP
15
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Write the formula
16
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What is the first step in solving a GP question
Convert any and every term into “a”, first term, and “r”, common ratio
17
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What is the formula of Sn in a GP
When r
18
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What is the formula of Sn in a GP
When r>1
19
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What is the sum to infinity
An infinite geometric sequence
20
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What is the formula for sum to infinity
When
( -1 < r < 1 )
( -1 < r < 1 )
Note 
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