The arithmetic sequence formula is given as, Formula 1: The arithmetic sequence formula is given as, an = a1 +(n−1)d a n = a 1 + ( n − 1) d. where, an a n = n th term, a1 a 1 = first term, and. d is the common difference. The above

3. Find a formula an for the nth term of the arithmetic sequence whose first term is a1 = −5 such that an − 1 − an = 8 for n ≥ 1. an = please show step by step please . Question:

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The formula for finding the common difference of an arithmetic sequence is, d = a n - a n-1.

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The answer to the math question is 42.

- the mean value of arithmetic series is x̅; - standard deviation of any arithmetic progression is σ. Then: a n = a 1 + d(n - 1) S = [n(a 1 +a n)]/2. x̅ = (a 1 +a n) /2. σ = |d|*√((n-1)*(n+1)/12) Example