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Kelton Ferguson
Mathematics
10 October, 15:21
213, 209, 205,
Find the 30th term
+3
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1
)
Gonzales
10 October, 15:45
0
a (30) = 97
Step-by-step explanation:
Notice how each new term is equal to the previous term, less 4. So this is a decreasing arithmetic sequence with common difference - 4 and first term 213:
The general a (n) = a (1) - 4 (n - 1) becomes
a (30) = 213 - 4 (30 - 1), or
a (30) = 97
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