In less than 1 min
In the above arithmetic progression , the last positive term is , and it is the term of the sequence. What is ?
The answer is 11.
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1 solution
We rewrote this progression into f ( x ) = 3 1 − 3 x . The maximum x such that f ( x ) > 0 is x = 1 0 . The question asked for x + f ( x ) = 1 0 + 1 = 1 1