Statement
'Enroll with us before 30th November to get the advantage of out 20% discount offer', an advertisement by a coaching class.
Assumptions
I. Discount offer is bound to attract good students as well.
II. Even those students who cannot afford to pay the fees of coaching classes may join this class.

the pattern is ... babc

All are rodents or rat family, except cat.

Barrow' is man-driven cart whereas others are usual.

Except option (d), all letters in pairs having difference of four.

The relationship is x : (x² - 9).

63/3 = 21
27/3 = 9

F

Except option (c) rest all are perfect squares.

Except, `Plate', all two in number.

All other terms are used to denote the size.