Question

If an= 3n+1 find the
the S5​

Answer 1

Step-by-step explanation:

$Tn = 3n + 1 \\ \\ T1 = 3(1) + 1 = 3 + 1 = 4 \\ T2 = 3(2) + 1 = 6 + 1 = 7 \\ T3 = 3(3) + 1 = 9 +1 = 10 \\ T4 = 3(4) + 1 = 12 + 1 = 13 \\ T5 = 3(5) + 1 = 15 + 1 = 16 \\ \\ ∴ \: \: Arithmetic \: \: Series \: \: is : \\ 4, \: \: 7, \: \: 10, \: \: 13, \: \: 16, \: ... \\ \\ a = 4 \\ d = 7 - 4 = 3 \\ \\ S5 = \frac{n}{2} (2a + (n - 1)d) \\ = \frac{5}{2} (2 \times 4 + (5 - 1)3) \\ = \frac{5}{2} (8 + (4)3) \\ = \frac{5}{2} (8 + 12) \\ = \frac{5}{2} \times 20 \\ = 5 \times 10 \\ \large{ \boxed{S5 = \underline{ \underline{ 50}}}}$

Answer 2

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.

if the length of a rectangular hexagon is x m then its parameter will be_____m.