IDNLearn.com offers a unique blend of expert answers and community insights. Discover prompt and accurate answers from our community of experienced professionals.
Step-by-step explanation:
Sn=n(2a+(n-1)d)
2
S20=20(2x3+(20-1)x-5)
2
S20=10(6+19x-5)
S20= 10(6-95)
S20=10x-89
S20=-890
Hope this helps you
Have a nice day