Mobile phones, laptops, and televisions are all electronic devices that are used for communication, entertainment, or information purposes.
On the other hand, a transformer is an electrical device used to transfer electrical energy between circuits, and it doesn’t belong to the same category as the other items.
Thus, the correct answer is (a) 1, 2 and 3, as these are all electronic devices used by consumers for different purposes.





Arun’s present age in years is 40% of Barun’s. In another few years, Arun’s age will be half of Barun’s. By what percentage will Barun’s age increase during this period?