Question

In how many ways can 2 letters be chosen from {B,C,D,E,F,G}

Answer 1

Answer: 20

Step-by-step explanation:

BC

BD

BE

BF

BG

CD

CE

CF

CG

DE

DF

DG

EF

EG

BB

CC

DD

EE

FF

GG

Answer 2

two letters can be chosen in 20 ways