Question

Which term of the A.P 53,48,43 is the first negative term

Answer 1

let its nth term be first negative
a=53 d=48-53= -5
Tn=a+(n-1)d
0>53+(n-1)(-5)
0>53-5n+5
0>58-5n
-58>-5n
5n>58
n>58/5=11 3/5
n=12