Answer:
–864
Explanation:
i don't know if you mean A.P or G.P
but lets use A.P
T1(a) = 216
d(common difference) = T2 – T1 = 36 – 216 = –180
T7 = a + (n – 1)d
= 216 + ( 7 – 1)–180
= 216 + (6) – 180
= 216 – 1080
= –864
i hope this helps
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