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Answer 1 · 2017-11-13T16:59:07

#12^(n-1)#

#1+12+144+...+# is a geometric series:

The nth term of a geometric series is:

#ar^(n-1)#

Where #a# is the first term, #r# is the common ratio and n is the nth term:

#a=1#

Common ratio is:

#12/1=144/12=12#

#:.#

nth term is:

#12^(n-1)#