Find the fifteenth term of the arithmetic progression 3, 9, 15, 21, ..

1.	Find the fifteenth term of the arithmetic progression 3, 9, 15, 21, .... ?
A.	85
B.	87
C.	80
D.	90
Answer» C. 80

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The value of <br><table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3</center></td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>5</center></td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>7</center></td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>9</center></td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>11</center></td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>13</center></td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>15</center></td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>17</center></td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>19</center></td><td rowspan="2"> is</td></tr><tr><td style="text-align: center;">1 .2 </td><td style="text-align: center;">2 .3 </td><td style="text-align: center;">3 .4 </td><td style="text-align: center;">4 .5 </td><td style="text-align: center;">5 .6 </td><td style="text-align: center;">6 .7 </td><td style="text-align: center;">7 .8 </td><td style="text-align: center;">8 .9 </td><td style="text-align: center;">9 .10 </td></tr></table>
<table><tr><td rowspan="2">The 30th term of the series 30, 25</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">, 21 , 16</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">,........ is</td></tr><tr><td style="text-align: center;">2</td><td style="text-align: center;">2</td></tr></table><br>
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<table><tr><td rowspan="2">The next term of the sequence </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"> , 3</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">, 6 , 8</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3</center></td><td rowspan="2"> ..............is : </td></tr><tr><td style="text-align: center;">x - 2</td><td style="text-align: center;">4</td><td style="text-align: center;">4</td></tr></table>
840, ?, 420, 140, 35, 7

Find the fifteenth term of the arithmetic progression 3, 9, 15, 21, .... ?

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