The sum of 4th and 6th terms in an arithmetic sequence is 20
a) Find the sum of its 1st and 9th terms?
b) Write any two pairs of terms having the same sum?
c) Find it's 5th term?
d) If the 3rd term is 7, then find it's 7th term?
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Answer:
Our formula is: an = a1 + (n-1)d.
Here, 'd' is the common difference, 2, and 'n' is the 20 since we're looking for the 20th term.
'a1' is the first term, and 'an' should be 'a20' , which is the 20th term.
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