Sum of a geometric series

Find the sum to infinity of the geometric progression whose first three terms are $7$ , $42$ and $6$ .

~4 minAnswer checked instantlyGeometric progressionInfinite sum

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. V. Geometrical Progression, Examples V.a, No. 19

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).