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If 8 D 48, 12 D 120 and 15 D 195, then what is the value of ’A’ in 19 D A? ;

a

323

b

360

c

312

d

347

Answer : Option C
Explanation :
8 α 48 ⇒ 8 × (8 – 2) = 48 ⇒ 8 × 6 = 48 12 α 120 ⇒ 12 × (12 – 2) = 120 ⇒ 12 × 10 = 120 15 α 195 ⇒ 15 × (15 – 2) = 195 ⇒ 15 × 13 = 195 Therefore, 19 α A ⇒ A = 19 × (19 – 2)
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