Question

Find the 51th term of the arithmetic sequence 25, 12 and -1

Answer 1

-625

Explanation:

1. the formula is:

`a_n=a_1+d*(n-1);`

where n - the number of the required term, d - the step between two neighbor terms, a₁ - the first term of the given sequence.

2. according to the formula above:

`a_(51)=25-13*(51-1)=25-650=-625.`