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If AB and BA are two-digit numbers and AB + BA = 121, what is the value of A + B?

1407Medium DSSSB TGT Computer Science 0 replies 1 views
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If AB and BA are two-digit numbers and AB + BA = 121, what is the value of A + B?

  • A9
  • B10
  • C12
  • D11
Correct answer: D

Explanation

AB + BA = (10A + B) + (10B + A) = 11(A + B) = 121, so A + B = 11.

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