Question

an=144,. a=23,. d=7 find the n

Answer 1

a(n) = 144

a(n) = a + d( n - 1 )

144 = 23 + 7( n - 1 )

144 - 23 = 7( n - 1 )

121/7 = n - 1

121/7 + 1 = n

(121 + 7 )/7 = n

128/7 = n

Answer 2

An=a+(n-1)d
144=23+(n-1)7
144=23+7n-7
144=16+7n
144-16=7n
128=7n
N=128/7



I think question is wrong.....thats y its came in fraction