Question

dada a p.a (21, 25, 29, 33, 37) determine:

a) a50 b) a81

Answer 1

an=a1+(n-1)*r

a50=21+(50-1)*4

a50=21+(49)*4

a50=21+196

a50=217

an=a1+(n-1)*r

a81=21+(81-1)*4

a81=21+(80)*4

a81=21+320

a81=341