7 21 3 d 7 33 If 'd' is the resultant of the first row, what will be the resultant of the second row?

Rules
(i) (Odd number) x (Composite odd number)
(ii) (Even number) + (Odd number)
(iii) (Even number) → (Perfect square number), then (Perfect square number) - (Even number)
(iv) (Odd number) ÷ (Prime odd number)
(v) (Odd number) - (Even number)
Solution
1st Row 7   21   3 ⇒ 7 x 21 = 147       [rule (i)]
⇒     147 ÷ 3 = 49 = d     [rule (iv)]
2nd Row d   7   33 ⇒ 49   7   33
⇒         49 ÷ 7 = 7   [rule (iv)]
⇒       7 x 33 = 231     [rule (i)]
∴ Resultant of second row = 231