6. The sum $$\sum _ { i = 0 } ^ { m } \binom { 10 } { i } \binom { 20 } { m - i } \text {, Where } \binom { p } { q } = 0$$ if $p > q$ is maximum when $m$ is (A) 5 (B) 10 (C) 15 (D) 20
6. The sum
$$\sum _ { i = 0 } ^ { m } \binom { 10 } { i } \binom { 20 } { m - i } \text {, Where } \binom { p } { q } = 0$$
if $p > q$ is maximum when $m$ is\\
(A) 5\\
(B) 10\\
(C) 15\\
(D) 20\\