@atmathlab: SUBFACTORIAL (DERANGEMENT) Definition: !n = number of ways to arrange n items so that none are in their original position Exact Formula: !n = n! (1 - 1/1! + 1/2! - 1/3! + ... + (-1)^n / n!) Recurrence Formula: !n = (n - 1) ( !(n - 1) + !(n - 2) ) Base Values: !0 = 1 !1 = 0 Approximation: !n ≈ n! / e (round to nearest integer) Examples: !2 = 1 !3 = 2 !4 = 9 !5 = 44 #math #mathtok #mathematics

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Tuesday 06 October 2026 17:01:57 GMT
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evawrobleski
Evawrobleski :
40 because only OGs know pemdas
2026-10-07 14:46:13
990
dramadriguez
Adriana R :
it's 40 because if yall don't know pemdas
2026-10-07 00:47:52
203
ilovegod202603
SQUIRREL!12345678 :
It’s 40
2026-10-14 02:58:05
0
anaisjdc9rp
Anaïs :
10-10x4+10 10-40+10 -30+10 -20
2026-10-06 17:08:13
360
iamsigma.andyoush
Kellyk :
because of PEMDAS it's 40
2026-10-14 02:11:56
0
shotoicyhot4
shoto⁷ :
40, use pemdas.
2026-10-14 03:07:45
0
lillian7093
💫🩷Lillian🩷💫 :
it's actually -20
2026-10-08 17:48:50
144
aperson9420
DLG :
70
2026-10-11 04:41:43
8
meow_ellie068
✝️Payton✝️ :
It’s -20
2026-10-11 18:24:37
5
ijustloveadobo
ᐟᐟ ⟢ xa33🫐 ˚. ᵎᵎ˖ :
10-10x4+10=-20
2026-10-07 02:45:49
36
cellla_hi
Cella :
I got 40
2026-10-12 23:34:39
0
nurnur8828
nurnur :
it's 40 pemdas 10x4 then minus 10 then add 10
2026-10-07 00:48:25
42
eymeric.legrand
Eymeric Legrand :
Is it 20? I got the 10 x !4, and !4 equals 9, the times ten is 90, and ten minus 90 is -80, plus 10^2 is 20. Am I right?
2026-10-06 17:15:44
7
scar.scar617
Scarlette💐🦦 :
Erm It’s 20
2026-10-10 00:15:20
1
macarooiiuu
🇳🇵♡♥︎~𝓡𝓲𝓭𝓪~♡♥︎🇳🇵 :
It's 10 right? Bc 10 take away 10 it's 0.then 0x4 is 0 plus10 it's 10
2026-10-14 01:00:33
1
r4ina_1s_n0t_k3wl
Raina :
10 x 4 is 40. 10-40 is -30 plus 10 is -20😭 I don’t know man
2026-10-07 10:42:58
39
lily_luna833
lily_luna833 :
There a hidden 2
2026-10-07 01:02:27
11
edwardalvarez200
Edward :
You could see a hidden 2 which is an exponent
2026-10-09 02:50:22
8
yzz_op1
yzz_op.★ :
4x10=40 40-10=30 30+10=40 ITS! 40
2026-10-12 12:01:36
1
miapk57
Mia :
10x4=40 40-10=30 30+10=40 -------40
2026-10-12 11:46:50
1
risingtide_ship
POMTREE_secret :
40 bc of pemdas
2026-10-11 18:15:00
3
laly30252
Laly :
It’s 10
2026-10-11 17:53:59
1
haeinja
olitv :
70 due it has a 10 with a 2
2026-10-13 17:16:16
0
yaretzitorres188
♡Yaretzi♡ :
10-10=0×4=0+10=10
2026-10-13 23:42:44
0
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