find the no.of terms of Ap 17, 14.5, 12 .......-38
Answers
Answered by
6
Here, a=17; d=-2.5; tn=-38
tn = a+(n-1)d
-38 = 17+(n-1)-2.5
-55 = (n-1)(-2.5)
-55/-2.5 = n-1
23 = n-1
n = 23
Hence, there are 32 terms in the A.P.
Answered by
2
Answer:
No. of term = 23
Step-by-step explanation:
In an A.P,
First term, a = 17
Common difference, d = - 2.5
Last term = -38 = an
Apply formula of A.P
an = a + (n - 1) * d
-38 = 17 + (n - 1) * (- 2.5)
-38 - 17 = (n - 1) * (- 2.5)
- 55/ - 2.5 = (n - 1)
22 = n - 1
22 + 1 = n
n = 23
No. of term = 23
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