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Question 12
A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
1, 7, 42, 210, 840, ?
Solution
Consecutive natural numbers in decreasing order are multiplied
1 $$\times7$$ = 7
7Â $$\times6$$ =Â 42
42Â $$\times5$$ =Â 210
210Â $$\times4$$ =Â 840
840Â $$\times3$$ =Â 2520
=> Ans - (D)
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