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1.
n-th term
$a_n=a_1\cdot q^{n-1}$
2.
Sum of first n terms
$S_n = a_1\frac{q^n-1}{q-1}$
3.
Sum of first n terms
$S_n = \dfrac{a_nq-a_1}{q-1}$
4.
Common raito
$q=\dfrac{a_n}{a_1}$