Is -60 a term of the A.P. 8,5,2,-1,....?
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Last term = -60
a=8
d= 5-8=-3
Tn= a+(n-1)d
-60=8+(n-1)(-3)
-60-8=(n-1)(-3)
-68=(-3)(n-1)
68÷3=(n-1)
68/3+1=n
71/3=n
The Value of n is a fraction so -60 is not a term of given AP
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