Question

In a triangle 4 3 7=42, 6 3 8=91, 5 3 9=?

Answer 1

Given:

In a triangle (Logical reasoning question)  4 3 7=42, 6 3 8=91, 5 3 9=?

To find:

The missing value.

Solution:

It is clear that,

$7^2-4^2-3^2=49-16-9$

$7^2-4^2-3^2=24$

Now, change the places of digits.

$7^2-4^2-3^2=42$

Similarly,

It is clear that,

$8^2-6^2-3^2=64-36-9$

$8^2-6^2-3^2=19$

Now, change the places of digits.

$8^2-6^2-3^2=91$

Using this pattern, we get

$9^2-5^2-3^2=81-25-9$

$9^2-5^2-3^2=47$

Now, change the places of digits.

$9^2-5^2-3^2=74$

Therefore, the required value is 74.