Answer to Question #237134 in Algebra for Mr. Lee

Question

The first tern of an A.P. is 2 and the 6th term is 12. Find the

sum of the first 12 terms.

Answer 1

$a1 +(n-1)d.....Ap series$

$sum$

$sn = 0.5n(2a+(n-1)d)$

$a1 = 2$

$a1 + 5d = 12$

$d= 2$

$0.5*12(2*2 + (12-1)2)$

$sum = 156$