Page 179 - Fixtures

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r +n (1 + rx)n = 1 − 4x + 15 x2 + ()
2 64 ( )
63 ( )
65 ( ) 63 ( ) ()
4
4

x 3 + r 8
x2

r x 3 + r 4
x3

6 () 35 ( ) 0( ) 12 ( )

35 12 T2k +4 35

Tk −2 ()

k (1 + x)18

12 ( ) 9( ) 6( ) 3()

[(a + 3b)2(a − 3b)2]15 [AHSME 1950] ( )

32 ( ) 31 ( ) 30 ( ) 15 ( )

2C(n,2) + n2 ()

C(4n,2) ( ) C(4n, 4) ( ) C(n + 2,2) ( ) C(2n,2) ( )

1C (2n + 2,n + 1) −C (2n,n) ( )
2

C(2n,n) ( ) C(2n,n + 2) ( )
C(n + 1,n) ( )
C(2n,n + 1) ( )

n ( )

∑C(k, 3)
k =3

C(n + 2, 4) ( ) C(n + 2,5) ( )