As per the details in the question the series is in the form of
The sum of the first two nos. is the third no.
∴ First term + Second term = Third term
⇒ 1 + 3 = 4 ;
Second term + Third term = Fourth term
⇒ 3 + 4 = 7 ;
Third term + Fourth term = Fifth term
⇒ 4 + 7 = 11 ;
Fourth term + Fifth term = Sixth term
⇒ 7 + 11 = 18 ;
Fifth term + Sixth term = Seventh term
⇒ 11 + 18 = 27 is wrong. It should be 29.
Sixth term + Seventh term = Eighth term
⇒ 18 + 29 = 47
Hence, 27 is wrong. It should be 29.
