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The 10th and 20th term of an ap are 73 and 143 find the first term. |
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Answer» Answer: a+9D = 73 a+19d = 143 now, by ELIMINATION METHOD. 10d = 70 d = 7 put VALUE in any eq. a + 9d = 73 a + 9×7 = 73 a + 63 = 73 a = 73 - 63 a = 10 |
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