Cost by 2 apples, 3 bananas and 1 coconut is Rs.26 Also the cost of 3 apples, 2 bananas and 2 coconuts is Rs.35. Then the cost of 12 apples 13 bananas and 7 coconut is
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Calcium, oxygen and carbon do not have the same number of protons in their nucleus. A substance that is made up of only one type of particle, is called a pure substance. ... As calcium carbonate has only one type of particle it is a pure substance.
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