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27. In an A.P of 51 terms, the sum of first three terms is 65and the sum of the middle three terms is 129. What isthe first term and the common difference of the series?A) 64,9/8B) 32,8/9C) 72, 9/8D) 187/9,8/9 |
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Answer» Answer: D) 187/9,8/9 Step-by-step EXPLANATION: Given a + (a + d) + (a + 2d)= 65 The middle terms are 25th , 26th and 27th terms => a + 24d + a + 25d + a + 26D = 129 => 3a + 75d 129 ….(2) From (1) and (2) d= 8/9 =>a= 187/9 |
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