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14 July, 11:20

jimhas 100 cards. there is a whole number from 1 to 100 on each card. nocards have the same number. Jim puts a Star on every card that has a multiple of 3 on it. he puts a circle on every card that has a multiple of 7 on it. what numbers are on the cards that have both a Star and a circle on them? the final line of your answer must list only these numbers.

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  1. 14 July, 11:23
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    21, 42, 63, 84.

    Step-by-step explanation:

    The cards with a star and a circle must be multiples of 3 and 7.

    So these must also be multiples of 21:

    These are 21, 42, 63 and 84.
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