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What is a number of 3 digits and multiple of 5 but less than 600 and can be formed from 1,3,5,7 and 9?
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What is a number of 3 digits and multiple of 5 but less than 600 and can be formed from 1,3,5,7 and 9?
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Jun 20, 2018
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what is a number of 3 digits and multiple of 5 but less than 600 and can be formed from 1,3,5,7 and 9?
Mathematics
high-school
Muffs
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any multipule of 5 ends with either a 0 or a 5
so we see that ther are no 0's in the list so it must end with 5
so the other 2 digits can be any number
wait, less than 600
so the first digit can be 1 or 3
some possible numbers are
135
175
195
315
375
395
those are the possible numbers
Dave Black
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Jun 24, 2018
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Dave Black
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