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consider different values of the n
for eg.....n=1
so the three numbers become 1,3,4...hence 3 is divisible
n=4
so the three numbers are 4,6,7.....hence 6 is divisible
for eg.....n=1
so the three numbers become 1,3,4...hence 3 is divisible
n=4
so the three numbers are 4,6,7.....hence 6 is divisible
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