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[" Find the sum: "],[[" (i) "1+(-2)+(-5)...

[" Find the sum: "],[[" (i) "1+(-2)+(-5)+(-8)+...+(-236),],[" (ii) "4-(1)/(n)+4-(2)/(n)+4-(3)/(n)+..." upto "nt]],[" (ii) "(a-b)/(a+b)+(3a-2b)/(a+b)+(5a-3b)/(a+b)+..." to "11" terms."]

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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 (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, (i) 4-(1)/(n)+4-(2)/(n)+4-(3)/(n) …………upto n terms (ii) 1+(-2)+(-5)+….+(-236) .

Expand : (i) (4a-5b)^(3) " " (ii) (a+2b)^(3)

Expand : (i) (4a-5b)^(3) " " (ii) (a+2b)^(3)

Find the values of a and b, when: (i) (a+3,b-2)=(5,1) (ii) (a+b,2b-3)=(4,-5) (iii) ((a)/(3)+1,b-(1)/(3))=((5)/(3),(2)/(3)) (iv) (a-2,2b+1)=(b-1,a+2)

Find the product : (i) (x+3)(x^(2)-3x+9) " " (ii) (7+5b)(49-35b+25b^(2)) (iii) (5a+(1)/(2)) (25a^(2)-(5a)/(2)+(1)/(4)) " " (iv) (a+b-2)[a^(2)+b^(2)+4(a+b)+4] .

Find the sum of the following A.P.'s : (i) 3,8,13, .... to 20 terms. (ii) 1,4,7,......... to 50 terms. (iii) 8,5,2, .... to 25 terms. (iv) (a+b), (2a+3b), (3b+5b), ........ to n terms.

Find the sum of the following A.P.'s : (i) 3,8,13, .... to 20 terms. (ii) 1,4,7,......... to 50 terms. (iii) 8,5,2, .... to 25 terms. (iv) (a+b), (2a+3b), (3b+5b), ........ to n terms.