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If a1 =b1=1 , an=a(n+1)+2 and bn=an+b(n-...

If `a_1 =b_1=1 , a_n=a_(n+1)+2 and b_n=a_n+b_(n-1)` , then find the value of `sum_(n=1)^15 a_nxxb_n`

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