El doceavo término es 72 y la razón 1/2 (un medio) en una PG. Obtener el octavo término.
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a×r^(12-1) = 72
a× (0.5)^11 = 72
a = 72×2^11
Octavo termino:
a× r^(8-1)
= a×r^7
= (72×2^11)×(0.5)^7
=72 × 2^11 × 2^-7
= 72 × 2^4
= 72 × 16
=1152