If, 1*2= 1,2*3= -1 and3*4= -5, Then find the value of 7*9= ?2*3 = -1

If, 1*2= 1,
2*3= -1 and
3*4= -5, Then find the value of 7*9= ?
2*3 = -1
1). -47
2). -29
3). -2
4). -9

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