Find a sum of 20th term of an ap 5 +10 + 15 +........using suitable formula
Answers
Answered by
1
Answer:
20 the term of an arithmetic progression is=150+(20-1)×-5 = 55
Answered by
10
Step-by-step explanation:
Sn= n/2[2a+(n-1)d]
n=20 , a=5 , d= 5 (10-5=5)
S(20) = 20/2 [2(5)+(20-1)5]
= 10(10+95)
= 10(105)
=1050
Hope it helps...
pls mark as brainliest...
Similar questions