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@Apu
Note for OP
+solved @user1 @user2...
to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.@Phalawor pura ques bhejo

Take transpose both sides to get P=3P'-I. Multiplying the given equation by 3 and adding it to this is 8P-4I=0 or 2P=I
Hence it should be C.
OOOOOOOOOOO
I SEE
Yo is this cleared?
oh yea i saw this morning
yea
done done
+solved @SirLancelotDuLac
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