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Q.

If r¯=3i¯+2j¯5k¯, a¯=2i¯j¯+k¯,b¯=i¯+3j¯2k¯ and c¯=2i¯+j¯3k¯ such that r¯=λa+μb+δc then μ,λ2,δ are in

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a

H.P

b

G.P

c

A.P

d

A.G.P

answer is A.

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Detailed Solution

r¯=λa¯+μb¯+δc¯3i¯+2j¯5k¯=λ(2ij+k¯)+μ(i+3j2k¯)+δ(2i+j3k¯)3=2λ+μ2δ2=λ+3μ+δ5=λ2μ3δ2λ+μ2δ+2λ+3μ+δ=3+222λ+μ2δ+2λ+3μ+δ=3+22μ=1and substituing μ=1λ-δ=1,λ-3δ=-3,μ=1,λ=3,δ=2μλ2,δ are in A.P 

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