P.P.T.-4 Q 14 to 26

Property-5(King) P.P.T->4 Q.9 to last & Vallis formula

If in an A.P. {t_(n)} , it is given that p. t_(p)=q.t_(q) then : t_(p+q)= cdots

If in an A.P. {t_(n)} , it is given that t_(p) =q and t_(q) =p then : t_(p+q)= cdots

If in a g.P. { t_(n)) it is given that t_(p+q) =a and t_(p-q) = b then : t_(p) = (A) (ab)^(1/2) (B) (ab)^(1/3) (C) (ab)^(1/4) (D) none of these

In Fig. 6.15, /_P Q R=/_P R Q , then prove that /_P Q S=/_P R T .