A) 20
B) 19
C) 18
D) None of these
Correct Answer: D
Solution :
Ans. First time he climb 1.5 ft second and onward he climb 1 ft every lift. In 18th lift he will reach \[=1\times 17+1.5\times 1=18.5\,\text{ft}\]You need to login to perform this action.
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