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| 1. |
5n-4; a12 and a15 |
| Answer» An = 5n-2First term,a = 5×1-2 = 3second term,a 2 = 5×2-2 = 8d = a2-a1 = 8-3 = 512th term = 5×12 - 2= 60-2 = 5815th term = 5×15 - 2= 75 - 2 = 73 | |