BINOMNI KOEFICIJENTI
BINOMNI KOEFICIJENTI
BINOMNI KOEFICIJENTI
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<strong>BINOMNI</strong> <strong>KOEFICIJENTI</strong><br />
Teorem 5<br />
( ) ( )<br />
n n + 1<br />
+<br />
0 1<br />
+ . . . +<br />
(<br />
n + r<br />
r<br />
)<br />
=<br />
(<br />
n + r + 1<br />
r<br />
)<br />
.<br />
( ) ( ) ( )<br />
n + r + 1 n + r n + r<br />
Dokaz I: Iz Teorema 2: = +<br />
r r r − 1<br />
( ) ( ) ( )<br />
n + r n + r − 1 n + r − 1<br />
= +<br />
r − 1 r − 1 r − 2<br />
( ) ( ) ( ) ( )<br />
n + r + 1 n + r n + r − 1 n + r − 1<br />
⇔ = + + .<br />
r r r − 1 r − 2<br />
Rastavljajući opet posljednji član, dobivamo<br />
( ) ( ) ( ) (<br />
n + r + 1 n + r n + r − 1<br />
= +<br />
r r r − 1<br />
+<br />
( )<br />
Sad tako nastavimo dok ne dodemo do člana<br />
n<br />
0<br />
.<br />
n + r − 2<br />
r − 2<br />
) ( )<br />
n + r − 2<br />
+ .<br />
r − 3<br />
() 21. studenog 2011. 9 / 27