What is the sum of all three-digit numbers divisible by 7?
Show answer & explanation
Correct answer: A
Explanation
First three-digit number divisible by 7 = 105
Last three-digit number divisible by 7 = 994
Number of terms = ((994 − 105)/7) + 1 = 128
Sum = 128 × (105 + 994)/2
= 64 × 1099
= 70336