Casio fx-991ES PLUS User Manual download pdf (Page 19)

E-18

To generate random integers in the range of 1 to 6

(RanInt) 1 (,) 6 

 6

 1

(Results shown here are for illustrative purposes only. Actual results will differ.)

To determine the number of permutations and combinations

possible when selecting four people from a group of 10

Permutations: 10

(nPr) 4 

5040

Combinations: 10 (nCr) 4  210

To perform the following calculations when Fix 3 is selected for the

number of display digits: 10 ÷ 3

s 3 and Rnd(10 ÷ 3) s 3 1

(SETUP)(Fix) 10  3  3 

10.000

(Rnd) 10  3  3  9.999

Complex Number Calculations

(CMPLX)

To perform complex number calculations, first press (CMPLX) to

enter the CMPLX Mode. You can use either rectangular coordinates (

a+bi)

or polar coordinates (

rθ) to input complex numbers. Complex number

calculation results are displayed in accordance with the complex number

format setting on the setup menu.

(2 + 6

i) ÷ (2i) = 3 – i (Complex number format: a + bi)

 2  6 $(

i) 2 $(i) 3–i

2 45 =

i B (Complex number format: a + bi)

() 45 

i = 2 45 B (Complex number format: rθ)

 2 C 2 C$(

i) 245

Note: • If you are planning to perform input and display of the calculation

result in polar coordinate format, specify the angle unit before starting the

calculation. • The

θ value of the calculation result is displayed in the range

of –180° 

θ180°. • Display of the calculation result while Linear Display

is selected will show

a and bi (or r and θ) on separate lines.

CMPLX Mode Calculation Examples

(1 – i)

–1

 (Complex number format: a + bi)

 1 $(

i)

(1 + i)

+ (1 – i)

= 0 

 1 $(

i)7 1 $(i)7 0

1515

1616

1717

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 45 46

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Casio fx-991ES PLUS User Manual Page 19

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