q.n8................
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Anonymous:
sorry its 8th actually
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an=a+(n-1)d
D=a2-a1
a1=21
a2=18
D=18-21
D=-3
so we not find which of the term is AP
so n = 0
an= 21+(n-1)×-3
0=21-3n+3
0=24-3n
3n=24
n=24/3
n=8
so 8 term is 0
HOPE IT'S HELP YOU
D=a2-a1
a1=21
a2=18
D=18-21
D=-3
so we not find which of the term is AP
so n = 0
an= 21+(n-1)×-3
0=21-3n+3
0=24-3n
3n=24
n=24/3
n=8
so 8 term is 0
HOPE IT'S HELP YOU
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you have did little mistake
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