7+10(1)/(2)+14+...+84

Find the sums given below: 7+(21)/(2)+14+....+84

(14.96 xx 10^(10)) - (3.84 xx 10^(8)) is expressed in standard form as

1- (1) / (5) + (1.4) / (5.10) - (1.4.7) / (5.10.15) + ... oo =

((1)/(1.4 )+ (1)/(4.7 ) +(1)/(7.10 )+(1)/(10.13 )+(1)/(13.16)) is equal to

Find the sum to n terms of each of the following series : (1)/(1.4) + (1)/(4.7) + (1)/(7.10)+…

Find the sum of the series : (1)/(1.4)+(1)/(4.7)+(1)/(7.10)+.... to n terms.

The value of 15(7)/(10)+3(1)/(5) of [5(1)/(8)-(2(1)/(4)+(5)/(3)xx(15)/(14)div(10)/(9) of (3)/(14))] is :

5-[(3)/(4)+{2(1)/(2)-(0.5+(1)/(6)-(1)/(7))}] is equal to (a)1(19)/(84) (b) 2(61)/(84) (c) 2(23)/(84) (d) 2(47)/(84)