Question

Find the algebraic expression of the AP 21,32,43...​

Answer 1

Answer:

1234

Step-by-step explanation:

Answer 2

Answer:

3825

Step-by-step explanation:

Given -

a = 21

d = a² - a¹

d = 32 - 21

d = 11

n = 25

we know the formula that,

sn = n/2{ 2a + (n-1)d}

Now,

sn = 25/2 {2 × 21 + (25 - 1) 11}

sn = 25/2 { 42 + 24 × 11}

sn = 25/2 (42 + 264)

sn = 25/2 × 306

sn = 25 × 153

sn = 3825

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