In the following number series two numbers have been put within brackets. Study the series carefully and select the correct alternative with respect to the series.

1, 9, 25, (36), 81, 121, (169), 225

The first bracketed number (from the left) is incorrect and the second is correct.

1, 9, 25, (36), 81, 121, (169), 225

The  logic followed here is :

IT IS SQUARE SERIES OF ODD NUMBER STARTIG FROM 1 TO 15.

BUT 36 IS NOT THE SQUARE OF 6 WHICH IS NOT AN  ODD NUMBER . SO  DEFINITELY IT IS THE WRONG TERM IN THE SERIES . INSTEAD OF 36 IT SHOULD BE 49 WHICH IS SQUARE OF 7 .

169 IS CORRECT AS IT IS SQUARE OF 13 WHICH IS AN ODD NUMBER

THEREFORE ACCORDING TO GIVEN OPTIONS

OPTION 4 IS CORRECT

The first bracketed number (from the left) is incorrect and the second is correct.