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Mice21 [21]
3 years ago
10

Find the sum of all 3 digit whole numbers that arw divisible by 13 ?

Mathematics
1 answer:
GuDViN [60]3 years ago
7 0
We have an arithmetic sequence with 

<span>a0 = 1st 3-digit number divisible by 13 </span>
<span>a0 = 104 </span>
<span>d = 13 (why?) </span>
<span>last term is largest divisible by 13 = 988 </span>
<span>how many terms? (988-104)/13 + 1 = 69 </span>

<span>S = 69/2(104+988) = 37674</span>
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