Question

sn = 4/2 (2a+(n-1)d) formula and explanation ​

Answer 1

Answer:

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

Step-by-step explanation:

Sn→Sum upto 'n' terms

n→number of terms

a→first term of the A. P

d→common difference (a2-a1)

Answer 2

★SOLUTION:-

• we know that sum of AP n term formula

$\implies \star\pink{ s_{n} = \frac{n}{2}(2a + (n - 1)d) }$

• there n=4 given in question

$\implies { s_{4} = \frac{4}{2} (2a + (4 - 1)d)}$

$\implies \: s_{4} = 2(2a + 3d)$

$\implies \: s_{4} = 4a + 6d$

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more to know

n th term formula

$\implies \star\pink{ a_{n} = (a + (n - 1)d) }$

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I hope it helps you