determine whether the following sequence is in ap if so find the 20th term of the progression -12,-5,2,9,16,23,30
Answers
Answered by
1
Answer:
yes.this sequence is in ap because there is the same difference that is 7
Answered by
0
Answer:
121
Step-by-step explanation:
The given A.P. is -12,-5,2,9,16,23,30
t1 = -12, t2 = -5, t3 = 2
a = t1 = -12
d =t2-t1 = -5-(-12)
= -5+12
= 7
a = -12, d = 7, n = 20, t20 = ?
tn = a+(n-1)×7
t20= -12+(20-1)×7
= -12+19×7
= -12+133
= 121
t20= 121
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