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a=2
b=4:2=2
5/a.b^n-1 = 5/2.2^6-1
=5/2^6
=5/64
5/2+5/4+5/8+5/16+5/32+5/64 = 5(32+16+8+4+2+1)/64 = 5(63)/64 =315/64 (b)