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Ans.=1040

hw 1040?

I the above 

3 2 => (3+2)*(3*2)=30 (correct)

7 3 =>(7+3)*(7*3)=210 but it was 410 there fore it is 200 extra and it is wrong

5 4 =>(5+4)*(5*4)=180 but it was 148 which is wrong.

8 5 =>(8*5)*(8+5)=520but it was 726 which is wrong

7 6=>(7*6)*(7+6)=546 (it is correct)

therefore the series is 1 right 3 wrong and 1 right...

following it

8 7 =(8*7)*(8+7)=840 +200 = 1040

this is as per my view...

CA bhargava