Question

how many three digit numbers are diviable by 7?
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Answer 1

Step 1:The first 3 digit number divisible by 7----->105

Step 2: The last 3 digit number divisible by 7----> 994

To find: Total number of number divisible by 7 between them

Step 3: [(Last-First)/divisibility test]+1

=>[(994-105)/7]+1

=>889/7  +  1

=>127+1

Answer------>128

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