find the square using the identity 191
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191²
=(200-9)²
=200²-2×200×9+9²
=40000-3600+81
=36400+81
=36481
=(200-9)²
=200²-2×200×9+9²
=40000-3600+81
=36400+81
=36481
anutaj:
very thanks
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