How many 3 digit numbers between 99 & 3000
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3 digit numbers between 99 and 3000 are
100,101,102,......999
this is anAP
first term =a =100
Common difference =d = a2-a1 =101-100=1
number of terms =n
last term =an =999
an=a+(n-1)d
1+((n-1)1=999
n-1=999-1
n-1=998
n=998+1
n=999
or
number of terms between 100 to 999
is 999
100,101,102,......999
this is anAP
first term =a =100
Common difference =d = a2-a1 =101-100=1
number of terms =n
last term =an =999
an=a+(n-1)d
1+((n-1)1=999
n-1=999-1
n-1=998
n=998+1
n=999
or
number of terms between 100 to 999
is 999
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