Solve for x.
x=1+13+12+13+12+....∞
1+13=43=1.333. The value of x will be slightly lesser than 1.333 as the denominator keeps increasing.
Look at the options -
Option a=51.7>2. This can never be the answer.
Option b=11.7<1. This also can never be the answer.
Option c=31.4>2. This cannot be the answer.
Option d=2.21.7≈1.29 which is the correct answer.