Question

if tn=2n-1 then find t5

Answer 1

tn=2n-1
t5=2*5-1
   =10-1'
   =9

Answer 2

Given Tn=2n+1S5=T1+T2+T3+T4+T5
To find the first five terms of the sries assign n= 1,2,3,4,5Tn = 2n+1T1 = 2(1)+1 // assign n=1 in the given equation //=3T2 = 2(2)+1 // assign n=2 in the given equation //=5T3 = 2(3)+1 // assign n=3 in the given equation //=7T4 = 2(4)+1 // assign n=4 in the given equation //=9T5 = 2(5)+1 // assign n=5 in the given equation //=11The first five terms are 3,5,7,9,11S5=T1+T2+T3+T4+T5=35 ..