For the infinite geometric sequence (x to base n) whose first four terms are 1.5, 3.6, 8.64 & 20.736
1) find the values of the first term a and the common ratio r and write down a recurrence system for this sequence.
2) Write a closed form for this sequence
3) Calculate the 7th term of sequence
4) how many terms of sequence are less than 30000
Thank you for your help
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