If first term of an A.P. is a ,second term is b and first q term then show that the sum of its first (p+q) term is zero.(p is not equal to q?

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If first term of an A.P. is a ,second term is b & first q term then show that the sum of its first (p+q) term is zero.(p is not equal to q?

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If first term of an A.P. is a ,second term is b & first q term then sh...

Sp=Sq

p/2[2a +(p-1)d]=q/2 [2a+(q-1)d]

p[2a +pd - d]=q[2a+qd - d ]

2ap + p2d - pd =2aq + q2d -qd

2ap-2aq +p2d -q2d -pd +qd =0

2a (p-q) +(p+q)(p-q)d -d(p-q)=0

(p-q)[2a + (p+q)d - d ]=0

2a + (p+q)d - d=0

2a + [(p+q)-1]d=0

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