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Question 42
Select the option that is related to the third number in the same way as the second number is related to the first number.
12 : 121 : : 10 : ?
Solution
$$12\times11-11 = 132-11 = 121$$
$$10\times9-9 = 90-9 = 81$$
             OR
$$12\times10+1 = 120+1 = 121$$
$$10\times8+1 = 80+1 = 81$$
Hence 81 will come in place of the question mark.
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