Question

of 11 terms of the
find the sum
AP,2,5,8​

Answer 1

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

Answer 2

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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