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Saurav Kumar

· started a discussion

· 1 Months ago

More than one answer (Question:146142.0)

227 is a prime number but others are not

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) 123
B) 171
C) 227
D) 147
Solution:
123  =   (11)2  +  2
171  =   (13)2  +  2
227  =   (15)2  +  2
147  =   (12)2  +  3

Knowledge Expert

· commented

· 1 Months ago

Dear student
Given answer is correct according to the logic used here.

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