Find the largest number of four digits which is exactly divisible by 18,25, 35
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.... 18=2×3×3
... 25=5×5
.... 35=5×7 therefore..lcm(18,25,35)=2×3×3×5×5×7=3150
now ...largest 4 digit number is 9999
now ...3150×2=6300
....3150×3=9450
.....3150×4=12600(but 5 digits)
....so....9450 is taken
therefore..9450 is the 4 digits largest number which is exactly divisible 18,25 and 35.....
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2
9450 Just find the prime factor and multipe all the series
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