The fourth term of an A.P is 65 and its seventh term is 80. What is the sum of its first
term a) and common difference d)
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Answer:
a + 3d = 65-(1)
a + 6d = 80-(2)
solving (1) and (2) we get
d = 5. and a = 50
sum of first term and common difference = 50+5 = 55
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