Question : If the operation ' * ' is defined by a * b = a + b – ab, then 5 * 7 equals:

Option 1: 12

Option 2: – 47

Option 3: – 23

Option 4: 35

Question : If a³ + b³ = 217 and a + b = 7, then the value of ab is:

Option 1: – 6

Option 2: – 1

Option 3: 7

Option 4: 6

Question : If $x:y=3:4$, then $4x+5y:5x–2y=?$

Option 1: $7:32$

Option 2: $32:7$

Option 3: $4:3$

Option 4: $5:2$

Question : Directions: If 7² A 7 B 9 = 16, and 5² A 5 B 7 = 12, then 9² A 3 B 8 = ?

Option 1: 17

Option 2: 92

Option 3: 86

Option 4: 35

Question : If $a+b+c=1, ab+bc+ca=-1$ and $abc=-1$, then the value of $a^{3}+b^{3}+c^{3}$ is:

Option 1: 1

Option 2: – 1

Option 3: 2

Option 4: – 2

Question : Directions: In a certain code language, RIVER is written as 10–3–5–2–10 then how will PETROL be written in the same code language?

Option 1: 13–5–8–9–4–15

Option 2: 12–2–8–10–13–15

Option 3: 11–2–7–10–13–16

Option 4: 12–2–8–10–4–16