Questions

Sum of all numbers in each row and columns must be 15.

In last row to gt sum as 15 missing number must replaced by 1. 

Bangalore-based Sagar Baheti has become the first visually impaired Indian runner to complete the historic Boston Marathon, the world's oldest and the hardest marathon to qualify for.

The famous hill-station Kodaikanal lies in Palani hills.

The carbon arc lamp was the first widely-used type of electric light and the first commercially successful form of electric lamp.

Here are the Carbon Arc Lamp Uses :

-Super bright light, capable of lighting a large length of street or a large factory interior.

-Was the ONLY electric light available to light large areas from 1800 - 1901.

-Was cheaper to light streets with the arc lamp than gas or oil lamps.