Which two signs have to be put in the place of ‘?’ to prove the following equation
\(\sqrt {81}\) ? 33 ? 27 = 91
+ , +
2
–, +
3
+ , –
4
Both 2 and 3
Which two signs have to be put in the place of ‘?’ to prove the following equation
\(\sqrt {81}\) ? 33 ? 27 = 9