Question

if a-b=1 or a³-b³ =61 then whats ab ?

Answer 1

ab = 20 is the answer for this question

Answer 2

(a-b)³= a3-b3-3ab(a-b)
(1)³= 61-3ab*1
1=61-3ab
1-61=-3ab
-60=-3ab
ab=20