Question

Find the wrong term in the given series: 
2, 7, 18, 45, 99, 209, 431

Answer 1

(2*2 + 3) = 7

(7*2 + 5) = 19

(19*2 + 7) = 45

(45*2+9) = 99

(99*2+11) = 209

(209*2+13) = 431

so, wrong term is 18.

Answer 2

wrong term is 18
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