" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
un = a + (n-1)b
u20= 203+(19×7)
= 203 + 133
= 336
sn = n/2(a2+(n-1)b)
s20= 20/2(2×203 + (19×7))
= 10(406 + 133)
= 5390