Step-by-step explanation:
Sn= n/2 [2a1 + (n-1) d]
= 20/2 [2(-2) + (20-1) -3]
= 10 [-4 + (19) -3]
= 10 [-4 + (-57)]
= 10 (-61)
= -610
Copyright © 2024 EHUB.TIPS team's - All rights reserved.
Answers & Comments
Step-by-step explanation:
Sn= n/2 [2a1 + (n-1) d]
= 20/2 [2(-2) + (20-1) -3]
= 10 [-4 + (19) -3]
= 10 [-4 + (-57)]
= 10 (-61)
= -610