Question
If A =
, then A–1 is equal to :
- none of these
The correct answer is: ![open square brackets table row cell – 5 end cell 2 row 3 cell – 1 end cell end table close square brackets](data:image/png;base64,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)
A–1 = ![fraction numerator a d j A over denominator vertical line A vertical line end fraction](data:image/png;base64,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)
|A| = – 1
adj A = ![open square brackets table row 5 cell – 2 end cell row cell – 3 end cell 1 end table close square brackets](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEoAAAAqCAYAAAAUJM0rAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAaPUZr5AAAAalJREFUeNrtmj1LA0EURYcgQSSNpLAUREREJCAWIiI2QcRCAhZiITbWYu9/sLe0ExELETuxsLALVkEQ/4FFCllCYL3DvGKFuLvEzc5b9144RdJscjIfb97EGJdwAGVNrIsyi0kjjqJ8iApj8JE1cA26oAfa4ECLKE15AvugJq8XwLO8R1EJmQavFJUuAUUlZ1Wmn3dRPVk878FpZH3QkHHwIou8ivJgDCyDM9AB8wokTYJb0NRaRzVl9xl15Rz3+WdE0qz2gjPwOJLsaL4AE9or80Xw7knSFLiSpUBVZX4ju0pF2BJJLU+i7jJaHzMXtQfeQB98yq+5oqwLMMyRiodiiqIoiqIoiqIohqIoiqIoiqIoauhsGtca/jKuN2UPzuegnvFz5ozrqraLKurRuFZLNfJeAzxk/JxLcDyC7+J96nXzmCpFF2X72B2K+j22PXsk69Q2RQ1+WJSTvHapoo4oe7+2a9xF5EZZRP2lH10TWRxRKRJQVHKWZEGnqEjslbq9yrIXkRWp1D/AIUX9zLpxl5GBYCv1nRx21vA/TD0eissgin/Ij3HxDfFGygWfWKryAAABEXRFWHRNYXRoTUwAPG1hdGggeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzE5OTgvTWF0aC9NYXRoTUwiPjxtZmVuY2VkIGNsb3NlPSJdIiBvcGVuPSJbIiBzZXBhcmF0b3JzPSJ8Ij48bXRhYmxlPjxtdHI+PG10ZD48bW4+NTwvbW4+PC9tdGQ+PG10ZD48bW8+JiN4MjAxMzs8L21vPjxtbj4yPC9tbj48L210ZD48L210cj48bXRyPjxtdGQ+PG1vPiYjeDIwMTM7PC9tbz48bW4+MzwvbW4+PC9tdGQ+PG10ZD48bW4+MTwvbW4+PC9tdGQ+PC9tdHI+PC9tdGFibGU+PC9tZmVuY2VkPjwvbWF0aD4cr707AAAAAElFTkSuQmCC)
so, A–1 = ![open square brackets table row cell – 5 end cell 2 row 3 cell – 1 end cell end table close square brackets](data:image/png;base64,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)
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