Find the sum `8/2+5/4+7/6`

Find the sum:  (i) 5/6+3+3/4 (ii) 2 3/5+4 7/(10)+2 4/(15)

Find the sum: 5/9+\ 6+1 5/7

Find the sum: 4(3)/(5)+2(7)/(8)

Find the sum 5^(2)+ 6^(2) + 7^(2) + ... + 20^(2) .

Re- arrange suitably and find the sum: (-4)/7+7/6+2/7+\ 3+\ (-11)/6

Find the sum: 2+4+6+\ .... +200 (ii) 3+11+19+\ ..... +803 (iii) (-5)+(-8)+(-11)+\ ...... +(-230)

Find the sum:  (i) 5/8+3/(10) (ii) 4 3/4+9 2/5

Find the sum of infinite terms of the series : 3/(2*4)+5/(2*4*6)+7/(2*4*6*8)+9/(2*4*6*8*10)+...........

Find the sum of infinite terms of the series : (3)/(2.4) + (5)/(1.4.6) + (7)/(2.4.6.8)+ (9)/(2.4.6.8.10)+……

Find the sum of the following algebraic expressions : 3a - 4b + 5c , 2a + 3b - 6c , - 5a + 8b + 7c