Sum of n terms of an a. P is -150 and it\'s sum of Next 10terms is -550 . Find its a p

Sum of n terms of an a. P is -150 and it\'s sum of Next 10terms is -55

1.	Sum of n terms of an a. P is -150 and it\'s sum of Next 10terms is -550 . Find its a p
Answer» It can be solved by the formula of sumSum of n terms =-150S(n-10)=-550n/2 (2a+(n-1)d)=-150n/2 (2a+(n-1)d)-10/2 (2a+(10-1)d)=-550