31)u6 = 23
u10= 43
beda(b) = 43-23/10-6
=20/4
=5
suku pertama (a)
a +5b =23
a + 5 . 5 = 23
a + 25 = 23
a=23-25
a= -2
suku ke30
Un = a +(n-1) b
u30 = -2 +(30-1) 5
= -2 + 145
=143
jumlah 30 suku pertama
Sn = n/2 (a + un)
S30= 30/2 (-2 +143)
=15 (141)
=2115
35)peluang mata dadu berjumlah kurang 10
=30/36 = 10/12=5/6
33) tinggi tangga
=√2,5² - 1,5²
=√6,25 - 2,25
=√4
=2 m
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31)u6 = 23
u10= 43
beda(b) = 43-23/10-6
=20/4
=5
suku pertama (a)
a +5b =23
a + 5 . 5 = 23
a + 25 = 23
a=23-25
a= -2
suku ke30
Un = a +(n-1) b
u30 = -2 +(30-1) 5
= -2 + 145
=143
jumlah 30 suku pertama
Sn = n/2 (a + un)
S30= 30/2 (-2 +143)
=15 (141)
=2115
35)peluang mata dadu berjumlah kurang 10
=30/36 = 10/12=5/6
33) tinggi tangga
=√2,5² - 1,5²
=√6,25 - 2,25
=√4
=2 m