#42# is a positive number. Any number cannot be divided by #0#, but if we divide a very small number close to #0#, the result is a very large number and smaller the number, lager will be the result. In short, we can say that if say #42# is divided by #x# and as #x# approaches #0#, the result tends to infinity.
Hence, one can say that #42# divided by #0# is #oo# (i.e. infinity)..