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InterviewSolution
| 1. |
The 15th term of (3 × 5) + (7 × 8) + (11 × 11) + . . . . is (1) 225 (2) 813 (3) 2773 (4) 3473 |
| Answer» <p></p><p class="MsoNormal" style="text-align: justify;"><span style="color:#000000"><span style="font-family:Arial,Helvetica,sans-serif"><strong>Correct option(3) 2773</strong></span></span></p><p class="MsoNormal" style="text-align: justify;"><span style="color:#000000"><span style="font-family:Arial,Helvetica,sans-serif"><strong>Explanation:</strong></span></span></p><p style="text-align: justify;"><span style="color:#000000"><span style="font-family:Arial,Helvetica,sans-serif">The first factors are in A.P., so also the second factors. </span></span></p><p style="text-align: justify;"><span style="color:#000000"><span style="font-family:Arial,Helvetica,sans-serif">The fifteenth term of 3 × 5 + 7 × 8 + . . . is </span></span></p><p style="text-align: justify;"><span style="color:#000000"><span style="font-family:Arial,Helvetica,sans-serif">[3 + 14 × 4] [5 + 14 × 3] = 59 × 47 = 2773 </span></span></p> | |