The odds in favour of A solving a problem are 3 to 4 and the odds against B solving the same problem are 5 to 7. If they both try the problem, the probability that the problem is solved is
1
\(\frac{{41}}{{84}}\)
2
\(\frac{{16}}{{21}}\)
3
\(\frac{5}{{21}}\)
4
\(\frac{1}{4}\)