How many numbers have 8-digits?
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Least 8 digit number ... 10000000
Largest no.....99999999
a=10000000,d=1,l=99999999
a+(n-1)d,
10000000+(n-1)1=99999999
N-1=99999999-10000000
N-1=89999999
N=90000000
Largest no.....99999999
a=10000000,d=1,l=99999999
a+(n-1)d,
10000000+(n-1)1=99999999
N-1=99999999-10000000
N-1=89999999
N=90000000
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