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Let a1=b1=1 and an=a(n-1)+(n-1),bn=b(n-1...

Let `a_1=b_1=1` and `a_n=a_(n-1)+(n-1)`,`b_n=b_(n-1)+a_(n-1)`,`AA n ge2`.If S=`sum_(n-1)^10b_n/2^n` and T= `sum_(n-1)^8 n/2^(n-1)`,then `2^7(2S-T)` is equal to

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