Question

In a a.p if the 12th term is -13 and the sum of its four terms is 24 find the sum of its first 10 terms.(plzzz answer)

Answer 1

Answer:

a¹²=a+(12-1)d

-13=a+11d

u will get the value of a........(1)

S⁴=4/2(2a+(4-1)d)

put the value of a u will get d

and then put the value of d in a in result you will have a and d put in it S10=10/2(2a+(10-1)d

Answer 2

Answer:

See answer in above picture