WAEC 2025 · Paper 1 · Q9✱✱

For three consecutive terms of a G.P., the middle term squared equals the product of the outer two.

Take the three terms $x, 1, y$: $1^2 = xy$, so $xy = 1$, option C.

Check: $x^2 = \frac{16}{9} \times 1$, so $x = \frac43$ and $r = \frac34$, which gives $y = \frac34$ and $xy = 1$.