Question

complete the series 10 : 91 : : 9 :? The answer is 72..How??

Answer 1

10×10(squaring)=100-9=91, similarly 9×9=81-9=72
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Answer 2

Answer: The complete series will be 10 :91 :9 : 81.9.

Step-by-step explanation:

Since we have given that

the series 10: 91 : : 9 : x

Since they are proportional to each each other.

So, it will look like :

$10\times x=91\times 9\\\\10x=819\\\\x=\dfrac{819}{10}\\\\x=81.9$

So, 9 : 81.9.

And the complete series will be 10 :91 :9 : 81.9.