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how many numbers between 200 and 600 are divisible by 4,5, and 6?
a smallest positive number which is divisible by 4,5,6 is lcm of these numbers which is 60 ,
now if any number is multiple of 60 then the condition is satisfied ...
nearest to 200 , 240 is the first number ....
now , a+(n-1)d = Tn
a=240 , d = 60 , Tn = 600
240+(n-1)60 = 600
n= 7
that means there are 7 numbers......
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