Find the sum of all integers between 10 and 500 which are divisible by 15
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Answer:
the integer between 10 to 500 divisible by 7 is
14,21,28,35,......
now
=500/7=71.42
the last term should be =71×7=497
now let the n'th term is 497
therefore
497=14+(n-1)7
(497-14+7)/7=n
n=70
therefore sum of 70 terms is
the sum is 17885
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