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9th multiple of 7
There is no such number. Since if x were the largest multiple of 3 and 7 then what about 2x? 2x would be a multiple of 3 since x is a multiple of 3; 2x would be a multiple of 7 since x is a multiple of 7; and 2x is bigger than x. So x cannot be the largest.
7 is.
If you mean is 28 a multiple of 7 then yes it is because 4 times 7 = 28
7 is a multiple of 28.Because:7 x 4 = 28.