Question

The number of ways in which four letter of the word DEGREE can be selected is​

Answer 1

There are 6 letters in the word 'DEGREE', namely 3E’s and D, G, R. Four letters out of six can be selected in the following ways

(i) 3 like letters and 1 different, viz. EEE + D, G, R

(ii) 2 like letters and 2 different, viz. EEE + any two of D, G, R.

(iii) All different letters, viz. EDGR.

So, the total number of ways =3+3+1=7

Answer:7