Question

How many 5 digit number can be formed from digits 0-6 if:

C. If one (1) is not to be used as the 1st digit and repetition is not allowed

Answer 1

Five digits are possible on the first place, six digits are possible on the second place, five digits are possible on the third place, four digits are possible on the fourth place, and three digits are possible on the fifth place.

$$5(6)(5)(4)(3)=1800$$