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5 times the 5th term is equal to 10 times the 10th term.then what is the 15th term? |
| 5 x a5 = 10 x a10 a5 = 2 x a10 a + 4d = 2 x( a + 9d) a + 4d = 2a + 18d 2a - a = -18d + 4d a = - 14d ..........(i) a15 = a + 14d a15 = -14d + 14d (from (i)) a15 = 0 |
