Question

If 12th term of the ap is 213 and sum of its first four term is 24. what is sum of first ten terms?

Answer 1

a12=a+11d
213=a+11d
213-11d=a(therefore equation)
s4=24
n/2(2a+(n-1)d)=24
4/2(2(213-11d)+3d)=24
2(426-22d+3d)=24
2(426-19d)=24
852-38d=24

Answer 2

Step-by-step explanation:

this is the answer plz mark as brainlist.