In a sequence of numbers in which each term after the first term is 1 more than twice the preceding term, what is the fifth term?
(1) The first term is 1.
(2) The sixth term minus the fifth term is 32.
Yeah friends, I just solved it completely to know whether the info is sufficient. It took me nearly 3 minutes. I am horrified. Can this be solved within 2 mins through any formula or expression ? Please-please-please tell me. I am dying to know.
Thanks in advance.
Question stem says - nth term =2* (n-1)th term +1
fifth term =?
1) first term = 1
second term = 2*first term+1
and so on.... you can find fifth term using the above formula but you don't really have to calculate.
2) sixth term - fifth term = 32
sixth term = 2* (fifth term) +1
you can find fifth term here. SUFFICIENT
answer is 'D'