How to find algebric form
of sequence ?
Answers
Answered by
5
Step-by-step explanation:
Given arithmetic sequence is 9, 15, 21,. First term = a = 9 Common difference = d =15 9 = 6 (A) For natural number n nth term = where Hence algebraic form of the sequence is . (B) nth term term (C) Sum of first n terms is given by, Sum of 24 terms is Sum of 50 terms is Sum of terms from twenty fifth to fiftieth (D) Let sum of first n terms is 2015, Solving above equation for n, the value of n is not a natural number. Hence 2015 can not be the sum of some terms of this sequence.
ANSWER
Answered by
18
Answer:
Given the first three terms and the last term of a finite arithmetic sequence, find the total number of terms.
Step-by-step explanation:
1) Find the common difference d .
2) Substitute the common difference and the first term into an=a1+d(n−1) a n = a 1 +
d ( n − 1 ) .
3) Substitute the last term for an and solve for n .
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