Step 1: Introduction of printing press in India
The printing press was introduced in India by the Portuguese missionaries in the 16\textsuperscript{th} century.
Step 2: Place of introduction
The first printing press was established in Goa in 1556. It was set up by Jesuit missionaries to print religious literature and Christian texts.
Step 3: Significance
This marked the beginning of the era of printing in India, which later spread to other regions like Kerala, Tamil Nadu, and Bengal.
Step 4: Conclusion
Hence, the printing press started first in India in the state of Goa.
\[
\boxed{\text{Goa}}
\]
Find the unknown frequency if 24 is the median of the following frequency distribution:
\[\begin{array}{|c|c|c|c|c|c|} \hline \text{Class-interval} & 0-10 & 10-20 & 20-30 & 30-40 & 40-50 \\ \hline \text{Frequency} & 5 & 25 & 25 & \text{$p$} & 7 \\ \hline \end{array}\]
Two concentric circles are of radii $8\ \text{cm}$ and $5\ \text{cm}$. Find the length of the chord of the larger circle which touches (is tangent to) the smaller circle.