The rule is simple. You need to find out the missing number in the above image.

The missing number is 1636. It was simple right.

Explanation

The apex number is the concatenation of the base two numbers square.

494 is concatenation of 7^{2},2^{2}

416 is concatenation of 2^{2},4^{2}

So the missing number is concatenation ofÂ 4^{2}, 6^{2}

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