Jawab:
1+3+5+7+9+....+99 =2541
Jawaban:
Un=a+(n-1)b
99=1+(n-1)×2
99=1+2n-2
99=-1+2n
99+1=2n
100=2n
n=100/2
n=50
Sn=n/2(a+Un)
S50=50/2(1+99)
S50=25×100
S50=2.500
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Jawab:
1+3+5+7+9+....+99 =2541
Jawaban:
Un=a+(n-1)b
99=1+(n-1)×2
99=1+2n-2
99=-1+2n
99+1=2n
100=2n
n=100/2
n=50
Sn=n/2(a+Un)
S50=50/2(1+99)
S50=25×100
S50=2.500
#backtoschool2019