Sharp EL-9900 User Manual

Returns the total number of combinations for selecting “r” item out

of  “n” items.

n

C

r

 =

n!

r!(n 

–

 r)!

• How many different groups of

7 students can be formed with

15 students?

1 5 

M C 6 7

E

Returns a factorial.

• Calculate 6 

×

 5 

×

 4 

×

 3 

×

 2 

×

 1.

6 

M C 7 E

CONV sub-menu items are to be used when converting a number

in decimal form (degrees) to a number in sexagesimal form

(degrees, minutes, seconds), or vice versa.

The “base 60” sexagesimal system, as well as the minutes-

second measurement system, was invented by the Sumerians,

who lived in the Mesopotamia area around the fourth millennium

B.C.(!) The notion of a 360 degrees system to measure angles

w