Question

N.C.E.R.T excercise 5.2
from sum no.2 to sum no. 14 or 15 please help. in any way picture message ,etc anything

Answer 1

14)
a=12
d=4
an=248
an=a+(n-1)×d
n=?
248=12+(n-1)4
236=[n-1]4
236/4=n-1
59=n-1
n=6