Fidorex

1. Find the number of rightmost zeros in 100! (100

Factorial)

2. Find the missing digit x in the following product without actual multiplication.

3. Find the unit digit in 1! +2!

+3! +×××+ 100!

4. Find 10 digit number that uses the each digit 0 to 9 exactly once and where the number formed by the first n digits is divisible by

n.

5.

D is mid point of AC.ÐBAD = ÐDBC = x. ÐADB = 45 Find x.