The maximum sum of the series `20+19 1/3+18 2/3+......` is (A) `310` (B) `300` (C) `0320` (D) none of these

Sum of series : 1+2+3+......... +n is (A) ((n)(n+1))/2 (B) n(n+1) (C) ((n+1)(n+2))/2 (D) none of these.

The sum of 50 terms of the series 1+2(1+(1)/(50))+3(1+(1)/(50))^(2)+ is given by (A) 2500 (B) 2550 (C) 2450 (D) none of these

If sum n^2=2870, then sumn^3= (A) 44100 (B) 48400 (C) 52900 (D) none of these

Sum of the infinite series (1)/(2!)+(1+2)/(3!)+(1+2+3)/(4!)+...to oo(e)/(3) b.e c.(e)/(2)d . none of these

The sum of the series 1^(3)+3^(3)+5^(3)+ ….. To 20 terms is

The sum of the series C(20,0)-C(20,1)+C(20,2)-C(20,3)+...-...+C(20,10) is

The value of 1/6+1/12+1/20+......+1/90 is : a )(1)/(5) b) (2)/(5) c) (3)/(5) d ) None of these

Find the sum of the series 1+(1+2)+(1+2+3)+(1+2+3+4)+...+(1+2+3+......+20).(A)1470(B)1540(C)1610(D)1370