10th term of an arithmetic sequence is 24 and it's 14th term is 36What is it's common difference?
What is the first term of this sequence?
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Answer:
» 10th term = 24
» 14th term = 36
To find: a and d.
Solution:
→ a + 9d = 24 ... (1)
→ a + 13d = 36 ... (2)
On solving we get
=> d = 3 and a = - 3
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