Question

If the first four terms of an arithmetic progression are :a,2a,b and a-6-b for some numbers "a" and "b" , then the value of the 100 term is:
a)-100
b)-300
c)150
d)-150

Answer 1

@hartnn and @Callisto

Answer 2

If i am right,a=a and d=a also

Answer 3

if it is given that terms are in AP
then you can find b in terms of a

and yes, thats correct

Answer 4

by applying formula :-