Question

How many 8 digit number are there in all

Answer 1

Let's see, the smallest 8 digit number is 10,000,000 and the largest is 99,999,999

so the total number of 8 digit numbers is

99,999,999 - 10,000,000 + 1 = 90,000,000

Answer 2

a1(first term)=10000000
an(last term)=99999999
d=1
we have to find n
an=a+(n-1)*d
99999999=10000000+(n-1)*d
89999999=(n-1)*d
89999999=n-1
n=90000000
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