Question

Is -60 a term of the A.P. 8,5,2,-1,....?

Answer 1

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