" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
a3=11
a7=35
a3=a1+2r=11
a7=a1+6r=35
a1+6r-a1-2r=35-11
4r=24
r=12
a1+2*12=11
a1+24=11
a1=-13