Question

. Find the 20th term of an arithmetic progression 2,5,8,11,.... Find the sum of first 12 terms of the arithmetic progression​

Answer 1

Answer:

a=2

d=3

n=20

an=?

a+(n-1)d

2+(20-1)3

2+19×3

2+57

a20=59

S12=n/2[2a +(n-1)d]

12/2 (2×2 + (12-1)3]

6(4+33)

6×36

216

S12=216

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