Find the sum of 5 6 + 7 8

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

Find the sum: 5/(8)+8/ ( 28)

Find the mode of (i) 7, 7, 8, 10, 10, 11,13, 14 (ii) 4, 5, 6, 7, 8, 7, 6, 5, 3, 4, 6, 7, 6

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

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

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)+……

A series is given in the form (1) + (2+3+4)+ (5+6+7+8+9)+..... Find the sum of the numbers in the rth bracket.

Find the sum to 8 terms of 3 + 6 + 12 + ...

Find the sum: 5/(12)+7/(16)