18. Evaluate 141 – 21+ 119 - Jo (1) 6 (2) 4 (3) 2 (4) 8.

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18. (1)( sqrt{41-sqrt{21+sqrt{19-sqrt{9}}}} ) ( =sqrt{41-sqrt{21+sqrt{19-3}}} ) ( (because sqrt{9}=3) ) ( =sqrt{41-sqrt{21+sqrt{16}}} ) ( =sqrt{41-sqrt{21+4}} ) ( (because sqrt{16}=4) ) ( =sqrt{41-sqrt{25}}=sqrt{41-5} ) ( (because sqrt{25}=5) ) ( =sqrt{36}=6 ) ( (because sqrt{36}=6) )

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