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`

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 (sin 30 + cos 30)-(sin 60 + cos 60) is

In Figure,the value of x is 12 (b) 15 (c) 20 (d) 30

In Figure,the value of y is 20^(0) (b) 30^(@) (c) 45^(@) (d) 60^(@)

The value cos 30^@.cos 60^@ - sin 30^@.sin 60^@ is:

The sum of 30C_(0)+30C_(4)+30C_(8)+.....+30C_(28) is equal to