find the sum of all odd numbers of 4 digits which are divisible by 9
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The odd number of 4 digits are 1017, 1035, ........9999
these are in A.P d = 18
tn= a + ( n-1) d
a. =.1017
d= 18
tn= 9999
9999= 1017 + (n - 1) 18
n. = 500
Sn= n/2 {A1 + an}
= 500/2 ( 1017 + 9999}
= 2754000
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