Let S be the set of all ( λ , μ) for which the vectors k ˆ j ˆ i ˆ + − λ , k ˆ μ j ˆ 2 i ˆ + + and k ˆ 5 j ˆ 4 i ˆ 3 + − , where λ – μ = 5, are coplanar, then ∑ ∈ λ + λ S ) μ , ( 2 2 ) μ ( 80 is equal to-

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2290

Let S be the set of all ( λ , μ) for which the vectors k ˆ j ˆ i ˆ + − λ , k ˆ μ j ˆ 2 i ˆ + + and k ˆ 5 j ˆ 4 i ˆ 3 + − , where λ – μ = 5, are coplanar, then ∑ ∈ λ + λ S ) μ , ( 2 2 ) μ ( 80 is equal to-

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