Question 40

If 841 = 3, 633 = 5, 425 = 7 then 217 = ?

Solution

$$841=8 \div 4 +1 = 3$$
$$633=6 \div 3 + 3= 5$$
$$425=4 \div 2 + 5=7$$
$$217=2 \div 1 + 7=9$$

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