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sade20
08.07.2019 •
Mathematics
Need again asap ! find the sum of the first 30 terms of the sequence below an=3n+2
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Ответ:
generate a few terms of the sequence using
= 3n + 2
the terms are 5, 8, 11, 14, 17
these are the terms of an arithmetic sequence
sum to n terms is calculated using
=
[ 2a + (n-1)d]
where a is the first term and d the common difference
d = 8 - 5 = 11 - 8 = 14 - 11 = 3 and
= 5
= 15( 10 + 87) = 15 × 97 = 1455
Ответ:
Ответ: