6
th term of an arithmetic sequence is 19 and its 10th term is 31
a) What is its common difference ?
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Answer: 3
Step-by-step explanation:
a: first term, d: common difference
6th term, a + 5d = 19 ---- 1
10th term, a + 9d = 31 ---- 2
Eqn. 2 - 1 (subtraction)
4d = 12
d=3
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