Question 16

Find the odd one out in the series: 5, 10, 17, 26, 38, 50

Solution

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The sequence follows $$n^2+1$$ for n = 2,3,4,5,6,7:

$$2^2+1=5$$

$$3^2+1=10$$

$$4^2+1=17$$

$$5^2+1=26$$

$$6^2+1=37$$

$$7^2+1=50$$

Now, we can clearly notice that 38 is the incorrect term. It should be 37.

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