Question

In an ice-breaking session of 10 students, each student has to give a greeting card to every other student. How many greeting card are required?

Answer 1

Each person GETS 9 cards from others. As there are 10 students in the session, we will require = 10 x 9 = 90 greeting cards.
Hope this helps you.

Answer 2

it must be 90 I think as one student from 10 will give card to each student so 9×10=90