A) 14
B) 23
C) 21
D) 13
E) None of these
Correct Answer: D
Solution :
Explanation: Option [d] is correct because digits sum of every number is 4. Let us see:- \[31=3+1=4\text{ }13=1+3=4\] \[40=4+0=4\] \[22=2+2=4\] Rest of the options is incorrect because of the correctness of option [d].You need to login to perform this action.
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