Asked by sindiswa

in 7;11;15. Then to calculate this i use this formula Tn=a+(n-1). So my question is what does "a" stands for?
Answered by bobpursley
It probably stands for the first term in a sequence.
Answered by Steve
Don't you also need a "d" to indicate the difference between terms?

Here Tn = 7+(n-1)*4
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