580 x 999 = ?

If 65 xx 99 =.6435 , 65 xx 999=64935 , 65 xx 9999 =649935 then 65 xx 999999 ........?

Calculate the frequency of yellow radiation having wavelength 580 Å. ( 1Å = 10^-10 m )

If ABB xx 999 =ABC123 (where A, B, C are digits) find the values of A,B,C.

Evaluate the following products with out actual multiplication : 999 xx 999

The successor of 999 is -

1 ml of 1 M solution is mixed with 999 ml of pure water.

Let f : N to R be a function satisfying the following conditions: f(1) =1 and f(1) +2f( 2)+ 3 f(3) + ………n f(n )" " f(n ) = n (n+1) , f(n) "for " n ge 2 The value of f(999) is (1)/(K) where K equals