Plzz tell quee no 7 ??????

Dear student ,

Given: an+bnan-1+bn-1=aban+bnab=an-1+bn-1an-12b+bn-12a-an-1-bn-1=0an-12b-12-an-1+bn-12a-12-bn-1=0an-12b-12-a-12+bn-12a-12-b-12=0an-12b-12-a-12-bn-12b-12-a-12=0b-12-a-12an-12-bn-12=0b-12-a-12=0b-12=a-12or    b=aan-12-bn-12=0or  an-12=bn-12    abn-12=1=ab0on comparingn-12=0n=12

Regards

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