83, the only number between 78 and 88 that has a 3 in the ones place.
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Answer:
13) 
14) 
15) 
16) 
Step-by-step explanation:
What was the point of this?
We get tne n-th term with: tn=1/3tn-1
We know that the first term is t1=81, so 81=1/3t*1-1
81=1/3t-1
82=1/3t
82*3t=1
3t=1/82
t=1/82*3=1/246
The second term is: 1/
2*(1/246)*2)-1
We get the third term by replacing n with 3 and so on...
I think this is the answer ( −∞,∞)