5th term of an arithmetic sequence is 36 and its 8th term is 57
a) What is its common difference ?
b) What is its 20th term ?
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Answer:
» 5th term = 36
» 8th term = 57
Solution:
» a + 4d = 36 ... (1)
» a + 7d = 57 ... (2)
On solving we get
=> d = 7 and a = 8
t20 = a + 19d
= 8 + 19 (7)
= 8 + 171 = 179
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