Question

complete the series 9 : 81 : : 13:? The answer is 72..How??

Answer 1

Answer:

hloo dear,

lets solve,

9:81::13:?

we know that product of mean= product of exterms

let 13:x

equation formed=

9x = 81×13

9x = 1053

x = 1053/9

x = 117  

thank you dear

Answer 2

The series form is 9 : 81 : : 13: 117.

Step-by-step explanation:

Given : Series 9 : 81 : : 13:?

To find : Complete the series ?

Solution :

Let the missing number be 'x'.

Series 9 : 81 : : 13: x

We know, If $a:b::c:d$ then $\frac{a}{b}=\frac{c}{d}$

Here, a=9, b=81, c=13 and d=x

Substitute,

$\frac{9}{81}=\frac{13}{x}$

Cross multiply,

$x=\frac{13\times 81}{9}$

$x=117$

Therefore, the series form is 9 : 81 : : 13: 117.

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