27. In an A.P of 51 terms, the sum of first three terms is 65
and the sum of the middle three terms is 129. What is
the first term and the common difference of the series?
A) 64,9/8
B) 32,8/9
C) 72, 9/8
D) 187/9,8/9
Answers
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7
Answer:
D) 187/9,8/9
Step-by-step explanation:
Given a + (a + d) + (a + 2d)= 65
=> 3a + 3d =65…. (1)
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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