Question 2

Four of the following five are alike in a certain way and so form a group. Which is the one that does not belong to that group ?

Solution

126 = $$5^{3} + 1$$

217 = $$6^{3} + 1$$

345 = $$7^{3} + $$ 2

513 = $$8^{3} + 1$$

730 = $$9^{3} + 1$$

=> 345 is the odd one out.


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