Question : Directions: If 1 * 2 = 1, 2 * 3 = –1 and 3 * 4 = –5, then find the value of 7 * 9 = ?
Option 1: –47
Option 2: –29
Option 3: –2
Option 4: –9
Correct Answer: –47
Solution :
Given:
1 * 2 = 1
2 * 3 = –1
3 * 4 = –5
(1 * 2 = 1→(1 + 2) – (1 × 2) = 3 – 2 = 1
(2 * 3) = –1→(2 + 3) – (2 × 3) = 5 – 6 = –1
(3 * 4) = –5→(3 + 4) – (3 × 4) = 7 – 12 = –5
Similarly, (7 * 9)→(7 + 9) – (7 × 9) = 16 – 63 = –47
Hence, the first option is correct.
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