If 23 * (-7) = - 161, which of the following is not true?

161 : 7 = 23

161 : (-23) = 7

-161 : 23 = - 7

-161 : (-7) = 23

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22 John's father is 5 times older than john and John is twice as his sister Alice. In two years to time sum of their age will be 58. What is their present age

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The process of using sample statistics to draw conclusions about population parameters is called