Arun
Last Activity: 4 Years ago
There is an unlimited number of identical of three rows.
Number of arrangement of 7 balls in a row =3
7
Number of arrangement of 6 balls in a row =3
6
Number of arrangement of 5 balls in a row =3
5
Number of arrangement of 4 balls in a row =3
4
Number of arrangement of 3 balls in a row =3
3
Number of arrangement of 2 balls in a row =3
2
Number of arrangement of 1 balls in a row =3
∴ Number of arrangement of almost 7 balls in row that can be made (n)=3+3
2
+3
3
+3
4
+3
5
+3
6
+3
7
As it is in GP
n=
3−1
3(3
7
−1)
=
2
3
(2187−1)
=
2
3
×2186
=3×1093
n=3279
