find the smallest number of 5-digit which is exactly divisible by 21 28 and 45
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LCM = 1260
smallest 5 digit number = 10000
10000 ÷ 1260 = 7 as quotient reminder also comes
1260 x 8 = 10080 is the smallest 5 digit number
(you can find answer by adding reminder with 10000)
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