Replce the ? sign with the appropriate number. Try to find the pattern of the numbers to find the missing number.

The missing number is 70
Explanation:
The pattern of the numbers are given below
(7-5)=2 -> (7+2)*(5+2)=63
(9-8)=1 -> (9+1)*(8+1)=90
(7-4)=3 -> (7+3)*(4+3)=70

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