document.write( "Question 1148235: Two APs Have The Same First And Last Terms. The First AP Has 21 Terms With A Common Difference Of 9. How Many Terms Has The Other AP If Its Common Difference Is 4? \n" ); document.write( "

Algebra.Com's Answer #769596 by ikleyn(52805) $\"\"$ $\"About$

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document.write( "(1)  The difference between the last and the first term of the first AP is 20*9 = 180.\r\n" );
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document.write( "(2)  The difference between the last and the first terms of the second AP is the same, 180.\r\n" );
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document.write( "(3)  The numbers of gaps between the terms of the second AP is   = 45.\r\n" );
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document.write( "(4)  Hence, the number of terms in the second AP is  45+1 = 46.    ANSWER\r\n" );
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