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The common ratio.
A sequence is geometric if each term is found by mutiplying the previous term by a certain number (known as the common ratio). 2,4,8,16, --> here the common ratio is 2.
This is a geometric sequence since there is a common ratio between each term. In this case, multiplying the previous term in the sequence by 10.
In this case, 22 would have the value of 11.
Find the 7th term of the geometric sequence whose common ratio is 1/2 and whose first turn is 5