If a =16 and b= 5, the value of (a2+ b2+ ab) / (a3 - b3) is ?

1.	If a =16 and b= 5, the value of (a²+ b²+ ab) / (a³ - b³) is ?
A.	1/11
B.	1/19
C.	121/3971
D.	None of these
Answer» B. 1/19

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If a =16 and b= 5, the value of (a2+ b2+ ab) / (a3 - b3) is ?

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If a =16 and b= 5, the value of (a²+ b²+ ab) / (a³ - b³) is ?