55. The sum of all 3-digit numbers which are multiples of 7 is: (a) 60336 (b) 70336 (c) 80336 (d) 90336
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highest three-digit number which is a multiple of 7 is 994. where l is the nth term, a is the first term, n is the number of terms, and d is a common difference. Here, a = 105, l = 994 and d = 7. Hence, the sum of all three-digit natural numbers, which are multiples of 7 is 70336.
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