Q.3.Find the sum of a) (-3)+5= b) (-5)+(-2)=

Find the sum 3 C_1 + 5C_2

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

Find the sum (i) 1+(-2)+(-5)+(-8)+ … +(-236) (ii) (4-(1)/(n))+(4-(2)/(n))+(4-(3)/(n))+ … upto n terms. (iii) (a-b)/(a+b)+(3a-2b)/(a+b)+(5a-3b)/(a+b)+ … to 11 terms.

Find the sum of: 24 terms and n terms of 2 (1)/(2) , 3 (1)/(3) , 4 (1)/(6) ,5 ,......,

Find the sum of the series 1 . 3^(2) + 2.5 ^(2) + 3.7^(2) +…+ to n terms

Find the sum of 1/(1!(n-1)!)+1/(3!(n-3)!)+1/(5!(n-5)!)+ ...,

Find the sum of series (3^3-2^3)+(5^3-4^3)+(7^3-6^3)+... to n terms

Find the sum of series (3^3-2^3)+(5^3-4^3)+(7^3-6^3)+ ... n terms.

Find the sum 3(1)/(5)+4(3)/(5)+7(2)/(5)

Find the values of a and b in each of the (5+3sqrt(2))/(5-3sqrt(2))= a+b sqrt(2)