The nth term an AP is given by 45 - 6n.
What is the sum of its first 15 terms
Answers
Answered by
0
Step-by-step explanation:
tn=45-6n
first term(t1)=45-6
=39
t2=33
a=39
d=-6
a/q
Sn=n/2{2a+(n-1)d
S15=15/2{78+14x-6}
=15/2x-6
=15x-3
=45
Similar questions