A two digit number ab is added to another number ba, which is obtained by reversing the digits then we get three digit number. Thus (a + b) equals to:
Options:
A . at least 18
B . 2ab
C . 2(a + b)
D . (a + b) ≥ 10
Answer: Option D When two two digit numbers are added and the resultant value is a three digit number. It means there must be a carry over (i.e. The sum of unit digits be greater than 9. Similarly, the sum of the tens digit is also greater than 9) Required numbers = 64 + 46 = 110 Option D is correct
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