IPMAT Rohtak 2020 (QA) PYQs

The number of 5-digit numbers consisting of distinct digits that can be formed such that only odd digits occur at odd places is

The number of triangles that can be formed by choosing points from 7 points on a line and 5 points on another parallel line is _________.

Fifteen people from different places come together for a family reunion. Each one of them had two gifts each for every other person. When the gifts were exchanged they hugged each other. What is the difference between the number of hugs and the number of gifts exchanged?