Tip:A–D to answerE for explanationV for videoS to reveal answer
If one AM (Arithmetic mean) a and two GM’s (Geometric means) p and q be inserted between any two positive numbers, the value of p3+q3 is
- A.
2apq
(Correct Answer) - B.
apq
- C.
a2pq
- D.
p+q+a
Explanation
AM = a, GM’s = p and q
Let the two numbers be 1 and 8.
AM:
a=21+8=29
GMs:
p=2, q=4
Then:
p3+q3=23+43=8+64=72
Also:
2apq=2×29×2×4=9×8=72
Therefore:
p3+q3=2apq
Answer: (a) 2apq
Explanation
AM = a, GM’s = p and q
Let the two numbers be 1 and 8.
AM:
a=21+8=29
GMs:
p=2, q=4
Then:
p3+q3=23+43=8+64=72
Also:
2apq=2×29×2×4=9×8=72
Therefore:
p3+q3=2apq
Answer: (a) 2apq