Question

2,4,6,8,10.... wite the formula to find the sum of 10 terms of ap

plzzz give the answer I have to write it in my test ​

Answer 1

Answer:

S10=10/5(2×2(10-1)2)

Step-by-step explanation:

Sn= n/2(2a+(n-1)d)

a=2

d=2

n=10

S10=10/5(2×2(10-1)2)

= 2(4×(9)×2)

=144

Answer 2

Step-by-step explanation:

Question

2,4,6,8,10.... wite the formula to find the sum of 10 terms of ap

Given

Ap - 2,4,6,8, 10.....

n= 10

To Find

sum of ten terms S10

Solution

Ap - 2,4,6,8, 10.....

Ap - 2,4,6,8, 10.....

n= 10

a1= 2

✿d= a2-a1

d= 4-2

d= 2

$\to \bold{Sn = \frac{n}{2} (2a + (n - 1) \times d)}$

Put the value in the above formula

$\bold{➯} S10= \frac{10}{2} [ 2 \times 2 +(10-1) \times 2] \\ \\ \bold{➯} S10= 5 [ 4 +9 \times 2] \\ \\ \bold{➯} S10=5 \times 2 2 \\ \\ \bold{➯} \bold\green{S10=110}$