of 11 terms of the
find the sum
AP,2,5,8
Answers
Answered by
0
Answer:
to find the sum use :- Sn = n/2(n-1)d
Step-by-step explanation:
To find d last term - first term
i.e 8- 2 = 6
By substituting,
S11 = 11/2(11-1)6
= 11/2 x 10 x 6
= 11 x 5 x 6
= 330
Answered by
1
Answer:
a = 2
d = 3
n = 11
an = ?
Step-by-step explanation:
an = a + (n-1) d
an = 2 + (11-1) 3
an = 2 + (10) 3
an = 2+30
an = 32
Sn=?
Sn=n/2 (a+an)
Sn=11/2 (2+32)
Sn= 11/2 (34)
Sn= 11 (17)
Sn= 187
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