Question 1148235
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(1)  The difference between the last and the first term of the first AP is 20*9 = 180.


(2)  The difference between the last and the first terms of the second AP is the same, 180.


(3)  The numbers of gaps between the terms of the second AP is  {{{180/4}}} = 45.


(4)  Hence, the number of terms in the second AP is  45+1 = 46.    <U>ANSWER</U>
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Solved.