SOLUTION: The sum of the first and second term of an AP is 4,if the tenth term is 19 find the sum of the fifth and sixth terms
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Question 857289: The sum of the first and second term of an AP is 4,if the tenth term is 19 find the sum of the fifth and sixth terms Answer by richwmiller(17219) (Show Source):
You can put this solution on YOUR website! an = a + (n - 1)d
4= 2a + d,
19= a + 18d
a = 53/35, d = 34/35
check
53/35+53/35+34/35
140/35=4
53/35+612/35=665/35
s = 53/35 + (4)34/35+ 53/35 + (5)34/35
s=412/35 =11 27/35
