Find the product
(
r
3
−
1
)
(
r
18
+
r
15
+
r
12
+
r
9
+
r
6
+
r
3
+
1
)
\displaystyle {\left({r}^{{3}}-{1}\right)}{\left({r}^{{18}}+{r}^{{15}}+{r}^{{12}}+{r}^{{9}}+{r}^{{6}}+{r}^{{3}}+{1}\right)}
(
r
3
−
1
)
(
r
18
+
r
15
+
r
12
+
r
9
+
r
6
+
r
3
+
1
)
Ans =
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