Question

Find the number of four letter word that can be formed from the letters of the word history.

Answer 1

Step-by-step explanation:

the number of four letter word that can be formed from the letters of the HISTORY is

=(no.of letters of the word) p (four letter word)

here p means permutation

=7p4

=(7!)/(7-4)!

=(7×6×5×4)(3!)/(3!)

=7×6×5×4

=840