The value of `(30,0)(30,10)-(30,1)(30,11)+(30,2)(30,11)-.............+(30,20)(30,30)`, where `(n,r)=nC_r` is a. `(30,10)` b. `(30,15)` c. `(60,30)` d. `(31,10)`

The value of ((30), (0))((30), (10))-((30), (1))((30),( 11)) +((30), (2))((30), (12))+.....+((30), (20))((30), (30))= ^60 C 20 b. ^30 C 10 c. ^60 C 30 d. ^40 C 30

Find the value of tan30^o

The value of sum_(r=0)^(40) r""^(40)C_(r)""^(30)C_(r) is

Find the value of cos 30^(@) + sin 30^(@)

The value of (2tan30^(@))/(1-tan^(2)30^(@)) is equal to

The points A(3,6,9),B(10,20,30) and C(25,-41,5)

Say True or False: (-90) + (-30) = 60

The value of ((50),(6))-((5),(1))((40),(6))+((5)/(2))((30),(6))-((5),(3))((20),(6))+((5),(4))((10),(6)) where ((n),(r )) denotes "^(n)C_(r ) , is

The value of sum_(r=0)^(10) (-1)^(r).4^(10-r)""^(30)C_(r)""^(30-r)C_(10-r) is equal to