Find the sum indicated in brackets of given geometric sequence
1. 1,3,9,... [S(6)]
2. 4,2,1,1/2,... [S(7)]
Find the sum indicated brackets of given geometric sequence
3. a=2,r=1/2 [S(4)]
4. a=12,r=1 [S(n)]
geometric sequence
2011-07-24 6:20 pm
回答 (2)
2011-07-24 8:08 pm
2011-07-24 8:14 pm
4. a=12, r=1 [S(n)]
When r=1, the sequence becomes:
12, 12, 12, 12, …
Therefore S(n)=12n
When r=1, the sequence becomes:
12, 12, 12, 12, …
Therefore S(n)=12n
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