Normal
cmr\[C_{n+1}^2+2.C_{n+2}^2+2.C_{n+3}^2+C_{n+4}^2=149\]
cmr
\[C_{n+1}^2+2.C_{n+2}^2+2.C_{n+3}^2+C_{n+4}^2=149\]
