Question

aobter a n PA=(2,7,12)...n=34

Answer 1

a1 = 2
a2 = 7
r = 7 - 2 = 5 ****
n = 34 
a34 = a1 + 33r
a34 = 2 + 33 ( 5 )
a34 = 2 + 165
a34 = 167  *
PA{ 2,7,12,17,22,27,32, 37,............................... 167 ]