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Arithmetic progression with the first term -7 and the common difference of d = (3-(-7)) = 10.
The n-th term is = + d*(n-1).
In your case = -7 + 10*(n-1). (1)
To find , substitute n= 110 into the formula (1) and calculate.
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For introductory lessons on arithmetic progressions see
- Arithmetic progressions
- The proofs of the formulas for arithmetic progressions
- Problems on arithmetic progressions
- Word problems on arithmetic progressions
in this site.