isi-entrance 2018 Q12

isi-entrance · India · UGA Combinations & Selection Counting Arrangements with Run or Pattern Constraints

Let 10 red balls and 10 white balls be arranged in a straight line such that 10 each are on either side of a central mark. The number of such symmetrical arrangements about the central mark is
(A) $\frac { 10 ! } { 5 ! 5 ! }$
(B) $10 !$
(C) $\frac { 10 ! } { 5 ! }$
(D) $2 \cdot 10 !$

Let 10 red balls and 10 white balls be arranged in a straight line such that 10 each are on either side of a central mark. The number of such symmetrical arrangements about the central mark is\\
(A) $\frac { 10 ! } { 5 ! 5 ! }$\\
(B) $10 !$\\
(C) $\frac { 10 ! } { 5 ! }$\\
(D) $2 \cdot 10 !$

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