SOLUTION: Only the 1, +, -, X, /, (, ) and = keys on a scientific calculator are working. How can a result of 75 be reached by pushing these keys less than 20 times?

Question 497191: Only the 1, +, -, X, /, (, ) and = keys on a scientific calculator are working. How can a result of 75 be reached by pushing these keys less than 20 times?
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
1+1 = 2, multiply that by 1+1. I'm pretty sure you can repeat functions by repeatedly pressing =, so you can get 2, 4, 8, 16. Subtract 1 to get 15. Multiply by 1+1+1+1+1 to get 75.

There's probably a faster way to do this, and one that requires less than 20 keystrokes. Try it and see.
RELATED QUESTIONS
a.) Suppose you have a Scientific calculator where some keys are broken. The only keys... (answered by josgarithmetic)

There are 88 keys on a new piano. If there are 12 pianos in a room of broken pianos, some (answered by JBarnum)

On a key ring are 6 keys, only one of which will open a certain door. If the first and... (answered by ikleyn)

The keyboard of a piano has seven full octaves plus two extra white keys and one extra... (answered by stanbon)

Allison has 6 keys and 4 locks. Each lock can be locked by only one of the 6 keys, and... (answered by ikleyn,greenestamps)

There are 88 keys on a new piano. If there are 12 pianos in a room of broken pianos, some (answered by stanbon)

There are 88 keys on a new piano. If there are 12 pianos in a room of twelve broken... (answered by nyc_function)

There are 88 keys on a new piano. If there are 12 pianos in a room of broken pianos,... (answered by checkley71)

A parent sets up a recording device linked to a computer to figure out what keys are hit... (answered by CPhill)