Question 935574

Find the sixth term in the sequence in which a^4=20 and r=-3
<pre><font face = "Tohoma" size = 4 color = "indigo"><b>With r being - 3, this seems to be a GP (geometric progression)
If you meant: {{{a[4] = 20}}}, then 6th term, or {{{highlight_green(a[6] = 180)}}}
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