In the study of transistor as an amplifier, the ratio of collector current to emitter current is 0.98 then the ratio of collector current to base current will be

The ratio of collector current to emitter current at constant collector base voltage is the current the amplification factor and given by
$\alpha =\frac{l_C}{l_E}=0.98$ (Given)
The ratio of collector current to the base current at constant collector-emitter voltage is given by
$\beta =\frac{l_C}{l_B}$
These are related as $\beta =\frac{\alpha }{1-\alpha }$
$\Rightarrow \beta =\frac{0.98}{1-0.98}=\frac{0.98}{0.02}=49$