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a6-a4=432 i a5-a4=108
a1 * q 5 - a1* q 3 = 432
a1 *q 4 - a1 * q 3 = 108
a1* q 3(q 2 - 1) = 432
a1* q 3(q -1) = 108
dziele stronami
(q 2 -1)/(q - 1) = 432/108, czyli q nie równe 1
(q 2 -1)/(q - 1) = 4
q +1 = 4
q = 3
a1 * 81 - a1 * 27 = 432
54 a1 = 432
a1 = 8
odp.: a1 = 8, q =3