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Answer 1 · 2017-11-13T16:14:20

#10485760#

The nth term of a geometric sequence is given by:

#color(red)(ar^(n-1))# , Where #a# is the first term, #r# is the common ratio and n is the nth term.

First term is 10.

Common ratio is:

#-40/10=160/-40= -4#

#:.#

#11th# term is:

#10(-4)^(11-1)=10485760#