find the sum of 3 digit numbers which are divisible by 7
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Substitute a = 105, l = 994 and d = 7. So, number of 3 digit numbers divisible by 7 is 128. Substitute a = 105, d = 7, l = 994 and n = 128. So, the sum of all 3 digit numbers divisible by 7 is 70336.
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