Find the sum of all natural number between 500 and 700 which are not divisible by 5
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Answer:
505 +510+515+....................+695
Tn=505+(n-1)5=695
(n-1)=190/5=38
n=39
S39=39/2[505+695]=39(600)=23400
501+502+................+699are 199 terms
S199=199[600]=119400
The sum of all the numbers between 500and700 which are not divisible by 5 is 119400-23400=96000
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