Texas Instruments TI-60 - Page 29

CHAPTER 1-3
ALGEBRAIC KEYS
The anMogarrthm Keys raise e and 10 to the power o« the number in the
display. INV In* raises e lo the power In the display INV log raises
10 lo the power In the display
Example : Calculate log 15.32, m 203.451. e‘ * m,s .10 x
Press display Comments
iC E/Cl fCBCI 0 Clear display and
pending operations
15.32 [jggj 1 185258765
203.451 In* 5.31542519
.69315 t/-j : IHY.JI feal o 49999859
□ t FWV 1385.455731
iawai (1/x] — Reciprocal key
The reciprocal key finT [1/x] divides the displayed number Into one For
example. 4 '.2nd . [1/*] equals 1/4 or .25,
r2nd [xl] [2nd (nPr) fMI [nCr] — Factorial, permutations, and
combinations keys
The factorial, permutations, and combinations keys act on the number in the
display, and do not affect calculations in progress The l2wd l [xt] key
calculates and displays the factorial of the number The factorial of any
integer x is wntten xl. and is equal to (1 x 2 x 3 x... x x). 01 Is equal lo 1
by definition The calculator can determine the factorial of any mtegor less
than 70.
The nsa ~; tnPrl key determines the possible permutations (number ol
arrangements) of n items taken r at a time This is usually written as
P , n The calculator actually calculates
nf
(r» — r)l
The raai [nCr] key determines the possible combinations of n Items taken
r at a time This is usually written as C " The calculator actually calculates
nl
(n-r)l ft
The values ol n and r are entered as n rrr. For instance, to enter 5 items
taken 2 at a trme. enter 5.002 If you enter 5 02. the calculator determines 5
items taken 20 at a time. If you enter 5 2 the calculator determines 5 items
taken 200 at a time “Error" is displayed If r is entered as more than three
digits
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