Question

WHICH TERM OF THE a.p. 72,68,64,............ IS ZERO?

Answer 1

d=68-72=-4
a=72
a+(n-1)d=0
72+(n-1)-4=72-4n+4=76+4n
76+4n=0
4n=-76
n=76/4=19 term




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Answer 2

tn=a+(n-1)d=0
=72+(n-1)4=0
=>72+4n-4=0
=>68+4n=0
=>4n=-68
=>n=-1