Question 81

Find the wrong number in the given series.
7, 8, 12, 21, 37, 61, 98

Solution

7, 8, 12, 21, 37, 61, 98

here the difference is squares of the no.

$$8-7 = 1^2 =1$$

$$12-8 = 2^2 =4$$

$$21-12 = 3^2 =9$$

$$37-21 = 4^2 =16$$

$$61-37 = 5^2 =25$$

$$98-61= 6^2 =36$$

so wrong term is 61

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Find the wrong number in the given series.7, 8, 12, 21, 37, 61, 98