The common difference of an arithmetic sequence is 6. what is the difference between 40th term and 20th term?
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Step-by-step explanation:
a+19d = 14, or
a = 14–19d …(1)
a+39d = -6, or
a = -6–39d …(2)
Equate (1) and (2)
14–19d = -6–39d, or
20d = -20, or
d = -1.
a = 14+19 = 33.
So T10 = a+9d = 33–9 = 24.
The 10th term is 24.
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