Question 39
$a_2=a_1+(-1)=1$
$a_3=a_2+(-1)^2=2$
$a_4=a_3+(-1)^3=1$
$a_5=a_4+(-1)^4=2$
Therefore the sequence goes 2,1,2,1,2,1......
$(2+1)\times50=150$
$a_2=a_1+(-1)=1$
$a_3=a_2+(-1)^2=2$
$a_4=a_3+(-1)^3=1$
$a_5=a_4+(-1)^4=2$
Therefore the sequence goes 2,1,2,1,2,1......
$(2+1)\times50=150$