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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