In an A.P the first term is 2, and the sum of the 1s...
In an A.P the first term is 2, and the sum of the 1st and the 6th term is 161/2. What is the 4th term
12
91/2
8
7
51/2
Correct answer is B
1st term a = 2; 6th term = a + (16-1)d = 2 + 5d
2 + (2 + 5d) = 161/2; 4 + 5d = 161/2
5d = 12.5 ∴ = 2.5
the 4th term is 2 + (4-1)2.5= 91/2
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