Texas Instruments TI-60 Owner's Manual page 31

CHAPTER 1-3
ALGEBRAIC KEYS
The antiloganihm keys raise e and 10 to the power ot the number in the
display. INV inx raises e to the power In the disptay INV log raises
10 to the power In the disptay
Example : Calculate log 15.32, In 203 451. e' "8U,10*
Press Display Comments
EBCHSflgl 0 Clear display and
pending operations
15.321® 1 185258765
203.451 In. 5 31542519
.69315 ; + /- ] WincnH 0 49999859
ffl awn® 1385.455731
2nd 11/x] - Reciprocal key
The reciprocal key 2nd I (1/x] divides the displayed number i«o one For
example, 4 [2nd (1/sJ equals 1/4 or .25.
real [xlj. '2nd i InPrJ, 2nd] [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 2nd I I*T] key
calculates and displays Ihe factorial ol the number The factonal of any
integer x Is written xl, and is equal to <1 x 2 x 3 x . x x). 01 is equal to 1
by definition The calculator can determine the factorial of any integer less
than 70.
The HSC (nPr] key determines the possible permutations (number of
arrangements) of n items taken r at a time This Is usually written as
P J* The calculator actually calculates
nl
(n - r)l
The 2nd |nCr] key determines the possible combinations of n Hems taken
i at a time This is usually written as C ? The calculator actually calculates
_id_
(n-r)l rl
The values of n and r are entered as n.rrr. For Instance, to enter 5 Items
taken 2 at a time, enter 5.002. II you enter 5 02. the calculator determines 5
items taken 20 at a time If you enter 5.2 ihe calculator determines 5 items
taken 200 at a time. "Error" is displayed It r is entered as more lhan three
digits
21-G8