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If Δ=a  p  xb  q  yc   r  z=16 then Δ1=p+x   a+x   a+pq+y   b+y   b+qr+z    c+z    c+r=?

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a
12
b
22
c
32
d
42

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detailed solution

Correct option is C

we have Δ=a  p  xb  q  yc   r  z=16Now,Δ1=2p+2x+2a   a+x   a+p2q+2y+2b   b+y   b+q2r+2z+2c    c+z    c+r      ∵C1→C1+C2+C3     =2p   x−p   a+pq   y−q  b+qr   z−r    c+r           taking 2 common from C1and then C1→C1−C2,C2→C2−C3     =2p   x   a+pq   y  b+qr   z    c+r - p  p  a+pq  q  b+qr   r  c+r      =2p   x   a+pq   y  b+qr   z    c+r - 0           since two columns C1 and C2 are identical       =2p   x   aq   y   br   z    c +2p   x   pq   y   qr   z    r       =2a    p   xb   q    yc    r   z + 0             since C1 and C2 are identical in second determinent,C1↔C2 and then C1↔C3                                                                                                                                                 ∵Δ=16      =2×16=32


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