How many 3 digit numbers less than 500 can we form using the digits 1,2,3,4,5,6,7
without REPETITION ?
answer 1:
starting from ones ---> (7)(6)(4) = 168
answer 2:
starting form hundreds ---> (4)(6)(5) = 120
Which answer is correct ? and WHY ??
How many 3 digit numbers less than 500 can we form using the digits 1,2,3,4,5,6,7
without REPETITION ?
answer 1:
starting from ones ---> (7)(6)(4) = 168
answer 2:
starting form hundreds ---> (4)(6)(5) = 120
Which answer is correct ? and WHY ??