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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

A.P

b

G.P

c

H.P

d

A.G.P

answer is A.

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Detailed Solution

3i+2j-5k=λ(2i-j+k)+M(i+3j-2k)+δ(-2i+j-3k)     3=2λ+M-2δ            2=-λ+3M+δ      -5=λ-2M-3δ        3=2λ+M-2δ              2=-λ+3M+δ 4=-2λ+6M+2δ     -5=λ-2M-3δ 7=7M  M=1         -3=M-2δ                                       -4=-2δ  δ=2 3=2λ+1-4       2λ=6      λ=3 M, λ2 , δ=1, 32, 2  A.P.

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