" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
a1=6
S2=2*2²+4*2=8+8=16
a1+a2=16
6+a2=16
a2=10
a2-a1=r
r=10-6=4
r=4