1). 19782). 3313). 139594). 15

1.	1). 19782). 3313). 139594). 15
Answer» As per the SERIES given in the question, it is CLEAR that it follows a pattern of: 15 × 4 + 5 = 65 65 × 5 + 6 = 331 331 × 6 + 7 = 1993 ≠ 1978 1993 × 7 + 8 = 13959 15, 65, 331, 1978, 13959 all these follow the pattern, except 1978. Hence, 1978 is INCORRECT.

Answer»

As per the SERIES given in the question, it is CLEAR that it follows a pattern of:

15 × 4 + 5 = 65

65 × 5 + 6 = 331

331 × 6 + 7 = 1993 ≠ 1978

1993 × 7 + 8 = 13959

15, 65, 331, 1978, 13959 all these follow the pattern, except 1978. Hence, 1978 is INCORRECT.

Discussion