29. How many natural numbers are there between 200 and 500, which are divisible by 7. Find their
sum
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43 no. are there between 200 and 500, which are divisible by 7.
sum = 1/2 ( n + an)
= 1/2 ( 43 + 497)
= 1/ 2 ( 540)
= 270.
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