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Question
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?
Options:
A .  131
B .  151
C .  184
D .  171
E .  161
Answer: Option E


The digit-sums are as follows: 131 → 1 + 3 + 1 = 5 151 → 1 + 5 + 1 = 7 181 → 1 + 8 + 1 = 10 → 1 + 0 = 1 171 → 1 + 7 + 1 = 9 161 → 1 + 6 + 1 = 8 Only 161 has its digit-sum even.



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