mariposa91
18.03.2021 •
Mathematics
The first two terms of an arithmetic
series are -2 and 3. How many terms
needed for the Sum to be 306?
Solved
Show answers
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Ответ:
Number of term n = 12
Step-by-step explanation:
Given:
a1 = -2
a2 = 3
Sum = 306
Find:
Number of term n
Computation:
d = a2 - a1
d = 3 - (-2)
d = 5
Sn = n/2[2a + (n-1)d]
306 = n/2[2(-2) + (n-1)5]
612 = n[-4 + 5n -5]
5n² - 9n - 612 = 0
Number of term n = 12
Ответ:
2 OR G
Step-by-step explanation: