Question
Question: The four<sup>th</sup>, seven<sup>th</sup> and ten<sup>th</sup> terms of a G.P. are p, q and r respec...
The fourth, seventh and tenth terms of a G.P. are p, q and r respectively, then
A
p2 = q2 + r2
B
p2 = qr
C
q2 = pr
D
r2 = p2 + q2
Answer
q2 = pr
Explanation
Solution
T4 = ar3 = p; T7 = ar6 = q ; T10 = ar9 = r
T4.T10 = a2 r12 = (ar6)2 = q2 Ž q2 = pr