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replace 7 with x:

x+2x=3x

x+2x+3x=6x

all ten of them -> 55x

Put the 7 back in:

55(7)=385

OR:

The first ten multiples of 7 are

7,14,21,28,35,42,49,56,63,70

The product of the multiples will then be

7+14+21+28+35+42+49+56+63+70= 385 :)

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Q: What is the product of the first ten multiples of 7?
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