Question

Find the sum of the 20th term of the Ap 2,5,8,,,,20

Answer 1

see attached file for your answer

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Answer 2

first term =2 and difference=3

n=20

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

Sn = 20/2[2×2+(20-1)3]

=10[4+19×3]

=10(4+57)

=10×61

=610