find the sum of numbers between 500 to 800 which are divisible by 7
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The list of numbers between 500 and 800 that are multiples of 7 is : 504, 511, 518,......................... 798. Clearly the above list is in AP with first term, a = 504 and common difference, d = 7.
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Answer:
504, 511 , 518 ...... 798
a= 504 , d =7, l= 798
sn = 43 /2 ( 504 + 798)
sn = 43/2 (1302 )
sn = 43 × 651
sn = 27993
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