draw the envelope envelope ✉️ || #shorts

The cell envelope

Name the egg envelopes.

Why does the nuclear envelope has pores in it ?

Viral envelope is made of

There are n letters and n corresponding envelopes. In how many ways the letters can be placed in the enveloped (one letters in each envelope) so that no letter is put in the right envelop.

There sre three letters asnd three envelopes. Find the total number of wys in which letters can be put into the envelopes so that each envelope has only one letter.