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U
A sample of U²³? (half-life=4.5×10?) yr ore is found to contain 23.8g of U²³? and 20.6
of Pb²??. Calculate the? age of the ore.
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U
a - b)(a + b - c) - abc is? (i) non positive
(ii) non negative
(iii) positive
(iv) negative
Please explain! thanks in advance :)
