How many 2

How many three lettered words can be formed from letters A B C D E G H if repeats are:
a) not allowed
b) allowed

Correct answer:

n₁ =  210
n₂ =  343

Step-by-step explanation:

$n_1=7\cdot 6\cdot 5=210$

$n_2=7\cdot 7\cdot 7=343$

Try another example

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