Question

find the number on the place of ? 13,13,15,27,47,67,97,153,?​

Answer 1

Answer:

385

Step-by-step explanation:

Tn=2Tn−1,n>0,T0=4

now, Tn

=2Tn−1−1

=2(2Tn−2−1)−1

=22Tn−2−2−1

=22(2Tn−3−1)−2−1

=23Tn−3−(1+2+22)

=2n(T0)−(20+21+22+…+2n−1)

(20+21+22+…+2n−1)=2n−1,

=2n(T0)−(2n−1)

=2n(T0–1)+1

=3∗2n+1, where T0=4 is considered

T7=3∗27+1=385