a1=108
an=999
r=9
999=108+ (n-1)9
999=108+9n-9
999-108+9= 9n
900=9n
n= 900/9=100
Resp:100
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a1=108
an=999
r=9
999=108+ (n-1)9
999=108+9n-9
999-108+9= 9n
900=9n
n= 900/9=100
Resp:100