13putting value and getting ans..my fav process[3]
If a, b, c are in A.P.
p, q, r are in H.P.
and ap, bq, cr are in G.P.
then(p/r)+(r/p) is equal to
(A) (a/c)+(c/a)
(B) (a/c)-(c/a)
(C) (b/q)+(q/b)
(D) (b/q)-(q/b)
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33 Answers
1already asked it seems : http://targetiit.com/iit_jee_forum/posts/a_p_g_p_h_p_1315.html
b2q2=acpr ...(1)
2b=a+c ........(2)
2/q=(p+r)/pr ......(3)
substitute b and q from (2) and (3) and put it in (1)
(a+c)2/4 * 4p2r2/(p+r)2=acpr
...
..
or
.
.
(p+r)2/pr=(a+c)2/ac
or p/r+r/p=a/c+c/a
13
1haan ji sahi hai mera tukka tha.......i guess tedious method hai.......