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0 / 60 seg.
What single-digit number should go in the box with the question? 6 5 9 2 7 1 4 3 5 ? 8 0 2 8 1
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C
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6
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Clue
ONE HAS THREE LETTERS IN THE WORD THREE HAS FIVE LETTERS IN IT FIVE HAS FOUR LETTERS AND FOUR HAS FOUR LETTERS IN IT (IF YOU TRY MORE NUMBERS THEY WILL ALWAYS COME BACK TO THE NUMBER FOUR: SO FOUR IS THE MAGIC NUMBER)
THE CONTENTS OR THE TEN ENVELOPES (IN DOLLAR BILLS) SHOULD BE AS FOLLOWS: $1, 2, 4, 8, 16, 32, 64, 128, 256, 489. THE FIRST NINE NUMBERS ARE IN GEOMETRICAL PROGRESSION, AND THEIR SUM, DEDUCTED FROM 1,000, GIVES THE CONTENTS OF THE TENTH ENVELOPE
THE JAR WILL BE HALF FULL IN 59 MINUTES. A MINUTE LATER, IT WILL DOUBLE AND WILL FILL THE JAR
THE MISSING NUMBER IS 4. SIMPLY ADD THE FIRST AND SECOND ROWS TOGETHER TO GET THE THIRD ROW VALUE. 65, 927 + 14, 354 80, 281
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