If p + m = 6 and p³ + m³ = 72, then the value of pm is

• 6

• 12

• 9

• 9

If  then the value of  is

• 7

• 

• 1

• 1

If 2s = a + b + c, then the value of s(s - c) + (s - a) (s - b) is

• ab

• abc

• 0

• 0

If  then the value of  is

• 0

• 2

• 1

• 1

If ab + bc + ca = 0, then the value of  is

• 0

• 1

• 3

• 3

If  then the value of  is

• 1

• 2

• 
• 

If , then  is

• 0

• 
• 
• 

The factors of  are

If 4x + 5y = 83 and 3x : 2y =  21 : 22, then (y - x) is

• 3

• 4

• 7

• 11

If x = 11, then the value of 
 is

• 5

• 10

• 15

• 20