Question

Replace the question mark with appropriate value.

• A. 690
• B. 689
• C. 780
• D. 789

Answer 1

The correct option is B 689

We need to derive the logic from given figures.

Refer to the image:

Each figure stands for its no. of sides.

Triangle = $3$; Square = $4$ and Pentagon =$5$.

Also observe that

Two figures placed next to each other stands for 1st number + 2nd number

And a figure inside another figure stands for inner number to the power outer number.

This explains:

1st Relation as $4+3=7$

2nd Relation as $3^3$ = $27$

3rd Relation as $3^4$ = $81$

so

4th Relation is $4^3+5^4$ = $64+625=689$

So option B.