Series and Odd Man out Practice Test 2

In the given series elements of the series have been arranged in the following manner:
First term = 1
Second term = 1 × 2 = 12
Third term = 1 × 2 × 3 = 123
Fourth term = 1 × 2 × 3 × 4 = 1234
Therefore, fifth term in place of the question mark = 1 × 2 × 3 × 4 × 5 = 12345