If a couple has three daughters, what are the chances that the fourth child will be a son?
1). 100%
2). 75%
3). 50%
4). 0%
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1. Which set of conditions represents the easiest way to liquify a gas ?
2. Schwann cells and nodes of Ranvier are found in
3. When cone H2S04 is added to dry KNO3 brown fumes are evolved. These fumes are due to
4. Aluminum can be purified by
5. In which of the following substances all carbon atoms are quaternary in nature ?
7. The element which is commonly used in nuclear for producing electricity by nuclear fission is
9. White Revolution is related to the increase in production of