random number for group

hello guy...im new about excel..i want to learn on how to generate random 50 number with 10 group..thank you

sorry i'm weak in english language..i hope u can understand.. a list of number from 1 until 50..then i want to make 10 group randomly with 5 numbers for each group..and each number dont repeat..
for example :

from number 1 until 50, i can generate randomly

group 1 : 20,11,23,9,13
group 2 : 1,5,35,4,32
group 3 : .....
group 4 : .....
until
group 10

thank you very much..

thanks...it's really help me...thanks again...

alansidman..how if i want to change the output to word? for example the rank is 1, then change to "a".
example:
5 = x
34 = q
42 = z

thanks