CBSE BOARD X, asked by mukuldipika, 2 days ago

please answer fast
it's really important

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Answered by bushravkazi

0

1. ap: 2x, x+10, 3x+2,...

a = 2x

n = 3

l = 3x+2

S3 = n/2 (a + l)

= 3/2 (2x + 3x + 2)

= 3/2 (5x + 2)

= (15x + 6)/2

= 15x/2 + 6/2

= 15x/2 + 3

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