1, 3, 5, 11, 21, ?, 85

Q. Find the missing term ?

       1, 3, 5, 11, 21, ?, 85

(A) 45

(B) 43

(C) 47

(D) 41

ANS: = (B) 43

Details:-

1x2+1 = 3

3x2-1 = 5

5x2+1 = 11

11x2-1 = 21

21x2+1 = 43

43x2-1 = 85

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