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nth term is an
let the sum of the terms be sn
sn-sn-1=an
=3n2+6n-{3(n-1)2+6(n-1)}
=3n2+6n-{3(n2+1-2n)+6n-6}
=3n2+6n-{3n2+3-6n+6n-6}
=3n2+6n-3n2-3+6n-6n+6
=6n+3
Hence number of terms, an=6n+3
Option B is correct
hope this helps you!!
thank you!!
let the sum of the terms be sn
sn-sn-1=an
=3n2+6n-{3(n-1)2+6(n-1)}
=3n2+6n-{3(n2+1-2n)+6n-6}
=3n2+6n-{3n2+3-6n+6n-6}
=3n2+6n-3n2-3+6n-6n+6
=6n+3
Hence number of terms, an=6n+3
Option B is correct
hope this helps you!!
thank you!!
Triyan:
please mark it as brainliest answer if u found this helpful!!
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