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
answer is C.
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Detailed Solution
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