121169
759779
612385
918700
4870462
4824066
3356958
1837400
100% of 20
a_n + a_n-1 =3n 2^n slove
$\pi$ *5^2
10% of 50
|B|={α∈N:α≤4000000 and (∃m∈N:α=17m)∧(∃n∈N:α=29n)}
200*117
70% of 10
find the sum of 9 and 10