The first two terms of an arithmetic
1 answer:
Answer:
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
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