Waves

The frequencies of three tuning forks \(\mathrm{A}, \mathrm{B}\) and \(\mathrm{C}\) are related as \(\mathrm{n}_{\mathrm{A}}>\mathrm{n}_{\mathrm{B}}>\mathrm{n}_{\mathrm{C}}\). When the forks \(\mathrm{A}\) and \(\mathrm{B}\) are sounded together, the number of beats produced per second is '\(n_1\)'. When forks \(\mathrm{A}\) and \(\mathrm{C}\) are sounded together the number of beats produced per second is '\(n_2\)'. How may beats are produced per second when forks \(\mathrm{B}\) and \(\mathrm{C}\) are sounded together?