if in an A.P ,the sum of p term is q and the sum of q term is p then find the sum of (p+q) term
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Tp=tq
tn=(a+(n-1)d)
tp=a+pd-d
tq=a+qd-d
a+pd-d=a+qd-d
pd=qd
tn=(a+(n-1)d)
tp=a+pd-d
tq=a+qd-d
a+pd-d=a+qd-d
pd=qd
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