Find the 27" term of the following AP
9.4.-1.-6.-11...
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Answer:
a = 9
d= a2-a1= 4-9
d= -5
n=27
an=a+(n-1)d
a27 = 9 +(27-1)(-5)
= 9-5(26)
= 9-130
a27= -121
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