Question

find and write formula in arithmetic progression​

Answer 1

baban vsbsvsbsbsbs. svsbsbsbsbssvs

Answer 2

Answer:

• The sum of first n terms of an arithmetic progression when the nth term is NOT known is Sn = n/2[2a+(n-1) d]
• The sum of first n terms of an arithmetic progression when the nth term, an is known is Sn = n/2[a1+an]