Question

Third term of a G.P > is 4. The product of first five terms is

Solution

Correct option is

45

Let the G.P. be a + ar +ar2 + ar‑3 + …   

Then as given T3 = ar2 = 4                                      …(1)

SIMILAR QUESTIONS

Q1

 

 Then x =

 

Q3

Consider an infinite geometric series with first term a and common ratio r. If its sum is 4 and the second term is 3/4, then

Q4

 

 

Q5

The harmonic mean of the roots of the equation 

Q7
Q8

Let the positive numbers a, b, c, d be in A. P. Then abc, abd, acd, bcd are

Q9

The sum of the series 1/2 + 1/3 + 1/6 +……. to 9 terms is