1.

If ab + 4 = cd and ba + 40 = dc, where ab, cd, ba and dc are the two digit prime numbers. Further b and d are the primenumber digits and a,c are neither prime nor composite. The value of ((ab + ba))/((ca + dc)) is:

Answer»

a. 1
B. `1/2`
C. `2`
d. can't be DETERMINED

Answer :B


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