7 digit numbers that have only 5 and 7 as their digits and divisible by both 5 and 7
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Find the total number of 7 digit numbers that are formed by only 5 and 7 as their digits and those 7 digit numbers are divisible by both 5 and 7.
The answer is 9.
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1 solution
Same with this
The numbers are 5557755,5577775,5755575,5777555,7555555,7575575,7755755,7757575,7775775