Question 25

Which numberis wrongin the given series ?
7, 9, 15, 27, 51, 99

Solution

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The difference between any 2 numbers is doubling with every step ahead. 
Difference between 9 and 15 is 6
So the number just before 9 should have a difference of 3 with 9. 
Hence, correct entry would be 9-3 = 6 and not 7

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