Missing Sequence Terms
ISEE Lower Level · Flashcards · Application
ISEE LOWER LEVEL · FLASHCARDS
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QUESTION
What is the missing term in the sequence
2
,
4
,
7
,
11
,
_
,
22
2, 4, 7, 11, \_, 22
2
,
4
,
7
,
11
,
_
,
22
if the differences are
+
2
,
+
3
,
+
4
,
…
+2, +3, +4, \dots
+
2
,
+
3
,
+
4
,
…
?
QUESTION
What is the missing term in the arithmetic sequence
3
,
_
,
13
,
18
,
23
3, \_, 13, 18, 23
3
,
_
,
13
,
18
,
23
?
QUESTION
What is the missing term in the sequence
100
,
50
,
25
,
_
,
6.25
100, 50, 25, \_, 6.25
100
,
50
,
25
,
_
,
6.25
?
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ANSWER
12.5
12.5
12.5
. The sequence is geometric with a common ratio of
1
2
\frac{1}{2}
2
1
, so the term after
25
25
25
is
25
×
1
2
=
12.5
25 \times \frac{1}{2} = 12.5
25
×
2
1
=
12.5
.
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