RRB JE 25th May 2019 Shift-1

Question 54

Find the missing number in the following series.
1, 1, 2, (…), 24, 120, 720

Solution

1, 1, 2, (…), 24, 120, 720

1

$$1\times 1= 1$$

$$1\times 2= 2$$

$$2\times 3= 6$$

$$6\times 4= 24$$

$$24\times 5= 120$$

and so on 

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