The correct answer is 49:1.
This can be determined using the following simplified formula:
Maximum intensity/ Minimum intensity ( Imax/Imin) =[ ( a1+a2)/ (a1-a2) ]^2, where a1 is the first amplitude and a2 is the second amplitude
Now putting the values of a1 and a2 in the formula:
Imax/ Imin=[ (4+3)/(4-3) ]^2= 49:1
very good morning dear $ have a marvellous day ahead: -)
so long questions you ask