Question

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Answer 1

Answer:

s3 =3+5+7+9=24

s3 = 24

Step-by-step explanation:

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Answer 2

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

Here, n= 3 , a = 3 and d = 2 { 5-3=2}

Putting values in the formula.:-

S3 = 3/2 [ 2(3) - (3-1) 2 ]

S3 = 3/2 [ 6 - 4 ]

S3 = 3/2 × 2

S3 = 3