The arithmetic mean of the series 1, 2, 4, 8, 16, ..... `2^n` is `(2^n-1)/(n+1)` (b) `(2^n+1)/n` (c) `(2^n-1)/n` (d) `(2^(n+1)-1)/(n+1)`

Sum of n terms of series 12+16+24+40+.... (A) 2(2^(n)-1)+8n (B) 2(2^(n)-1)+6n(C)3(2^(n)-1)+8n(D)4(2^(n)-1)+8n

Sum of n terms of series 12+16+24+40+.... (A) 2(2^n -1)+8n (B) 2(2^n-1)+6n (C) 3(2^n-1)+8n (D) 4(2^n-1)+8n

The mean deviation of the series a , a+d , a+2d ,.....,a+2n from its mean is (a) ((n+1)d)/(2n+1) (b) (n d)/(2n+1) (c) (n(n+1)d)/(2n+1) (d) ((2n+1)d)/(n(n+1))

The mean deviation of the series a , a+d , a+2d ,.....,a+2nd from its mean is (a) ((n+1)d)/(2n+1) (b) (n d)/(2n+1) (c) (n(n+1)d)/(2n+1) (d) ((2n+1)d)/(n(n+1))

The mean deviation of the series a , a+d , a+2d , , a+2n from its mean is ((n+1)d)/(2n+1) (b) (n d)/(2n+1) (c) (n(n+1)d)/(2n+1) (d) ((2n+1)d)/(n(n+1))

The arithmetic mean of 1,2,3,...n is (a) (n+1)/2 (b) (n-1)/2 (c) n/2 (d) n/2+1

The arithmetic mean of 1,2,3,...n is (a) (n+1)/2 (b) (n-1)/2 (c) n/2 (d) n/2+1

The arithmetic mean of 1,2,3,...n is (a) (n+1)/(2) (b) (n-1)/(2) (c) (n)/(2)(d)(n)/(2)+1