One Day 15 Questions

There is a question paper consisting of 15 questions. Each question has an internal choice of 3 options. In how many ways can a student attempt one or more questions of the given fifteen questions in the paper?

JEE Mains 2020 - 15 Days Revision | Motion - Quick Revision + Important Questions | Physics

And Then One Day: A Memoir is an autobiography of

One day is equal to

15 men can complete a work in 210 days. They started the work but at the end of 10 days, 15 additional men, with double efficiency, were in- ducted. How many days in all did they take to finish the work ?