0.2+0.22+0.222+....." to "n" terms is equal to (a) "(2)/(9)

0.2 + 0.22 + 0.222+ …. upto n terms is equal to

The sum of 0.2 +0.22+0.222+ … to n terms is equal to

The sum of 0.2+0.22+0.222+. . . . To n terms is equal to

cot^-1 (9/2) + cot^-1 (25/2) + cot^-1 (49/2) + ........ to n terms is equal to

The value of (n+2).^(n)C_(0).2^(n+1)-(n+1).^(n)C_(1).2^(n)+(n).^(n)C_(2).2^(n-1)-….." to " (n+1) terms is equal to

1.1!+2.2!+3.3!+.......n.n! is equal to

1+1.1!+2.2!+3.3!+......n.n! is equal to

1+1.1!+2.2!+3.3!+.......+n.n! is equal to