How many three digits number can be formed by using the digits 1,2,3,4,5?
Choices:
A) 152	B) 125	C) 225	D) 325	E) 252
Here the repetition of digits allowed. The unit place of the number can be filled in by any of the given numbers in 5 ways. Simillarly each one of the ten's and the hundred's place can be filled in 5 ways. Therefor the total number of required numbers =5*5*5= 
<gadget id="calculator">5*5*5</gadget>
<output>125</output>
125 Answer : 125
<result>B</result>
How many three digits number can be formed by using the digits 1,2,3,4,5?