Find the first term of the arithmetic progression (аn) if а₂₁ = -60, d = 2,5
| June 21, 2021 | education
Let’s calculate what the first element of the sequence will be equal to, since we know that it is set by the conditions by which a21 is equal to -60, while the difference is 2.5:
a1 + 2.5 * (21 – 1) = -60.
a1 = -110.
Answer: -110.
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