Page 155 - Bangladesh_classwiz_BOOK2018_rev_Neat

c~‡e©i g‡Z Table Mode e¨envi K‡i 30wU gvb †ei Kiv hvq| hv wb‡P w¯Œb G †`Lv‡bv n‡jv

14.6 mgv‡ek e¨envi K‡i m¤¢vebv wbY©q

¯^vfvweK fv‡e, wU wRwbm †_‡K wU wRwbm evQvB Kivi wbqg,

!
ⁿ = ( − )! ! [! wPýwU Gi Rb¨ quevUb Pvc‡Z n‡e|]

e¨envi Ki‡Z n‡j qPevUb Pvc‡Z n‡e| GKwU D`vniY Gi gva¨‡g eySv hvK,

GKwU cv‡Î 8wU jvj, 4wU Kv‡jv I 3wU mv`v ej Av‡Q| 3wU ej ˆ`efv‡e †bqv n‡jv; ( )2 wU ej jvj

( ) Kgc‡ÿ 2wU jvj ej nevi m¤¢vebv wbY©q Ki?

©
( )2 wU jvj ej nevi A_- 8wU jvj ej n‡Z 2wU ej evQvB Kiv Ges Ab¨ is‡qi 7wU ej n‡Z 1wU ej evQvB
Kiv|

∴ NUbv RM‡Zi †gvU NUbv =
15
3
8
2wU jvj ej evQvB Gi NUbv =
2
Ab¨ is‡qi 1wU ej evQvB Gi NUbv =
7
1
8 2 × 1 28
7
∴P (2wU jvj I wfbœ is‡qi GKwU ej) = =
15 3 65

(Key log- a8qP2O7qP1$15qP3=)

( ) Kgc‡ÿ 2wU jvj ej nevi A_©- jvj ej 2wU A_ev 3wU

 (2 wU jvj ej Ges 1wU wfbœ is‡qi ej) + (3 wU jvj ej)
7
8 × 1 8 3 36
2
= + =
15 3 15 3 65

150