Casio fx-7400G PLUS Basic Operation - Manual (Page 21)

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Basic Calculations Chapter 2
Example To calculate x and y when r = 25 and
θ
= 56
°
Operation Display
!Zcc1(Deg)Q
K[2(ANGL)[[
2(Rec()25,56)w
Ans
1 –13.979 –
→ 13.97982259 (x)
2 –20.725 – → 20.72593931 (y)
(5) Permutation and Combination
u uu u u Permutation u uu u u Combination
Example To calculate the possible number of different arrangements
using 4 items selected from 10 items
Formula Operation Display
10
P
4
= 5040 10K4(PROB)
2( n P r )4w 5040
Example To calculate the possible number of different combinations of
4 items selected from 10 items
Formula Operation Display
10
C
4
= 210 10K4(PROB)
3( n C r )4w 210
(6) Other Things to Remember
k k k k k Multiplication Sign
You can leave out the multiplication sign in any of the following cases.
• In front of the following scientific functions:
sin, cos, tan, sin –1 , cos –1 , tan –1 , log, In, 10
x
, e
x
, , 3 , Pol( x , y ), Rec( r ,
θ
), d / dx ,
Seq, Min, Max, Mean, Median, List, Dim, Sum
Examples: 2 sin30, 10log1.2, 2 3, etc.
• In front of constants, variable names, Ans memory contents.
Examples: 2
π, 2AB, 3Ans, 6X, etc.
• In front of an open parenthesis.
Examples: 3(5 + 6), (A + 1)(B –1)
n ! n !
n Pr = ––––– n Cr = –––––––
(n – r)! r ! (n – r)!