There are 26 different device types in total. But categorically 3 main i.e mobile,laptop/computer,tablet

Doubt in the below ques: Weekly Engagement: To measure the activeness of a user. Measuring if the user finds quality in a product/service weekly. Your task: Calculate the weekly engagement per device? There are 26 different device in total. But categorically 3 main i.e mobile,laptop/computer,tablet. Do you want all 26 device or in 3 main device types?