sum of how many terms of arithmetic progression 15, 10, 5,..... Will be zero
Answers
Answered by
0
answer15,10,5,...….
a=15
d=10−15=−5
Sn=2n[2a+(n−1)d]
S10=210[2×15+(10−1)(−5)]
=5[30−5×9]
=5[30−45]
=5(−15)=−75.
Similar questions