Question

in a ap if twelth term is -13 and sum of four first term is 24,find thebsum of first 10 terms​

Answer 1

Answer:

0

Step-by-step explanation:

Given , a12=-13

S4=24

Wkt

An = a+ (n-1)d

-13= a +11 d

a=-13-11d-----(1)

Also , sn = n/2 ( 2a+(n-1)d)

24=2(2a+3d)

12=2a+3d ---(2)

Putting a's value from (1) in (2)

12 = -26-22d+3d

12+26=-19d

38=-19d

d=-2----(3)

Putting value of d's in (1)from (3)

a=-13-11(-2)

a=-13+22

a=9

Sum of first 10 terms be :

S10= 5(18+-18)

S10 = 0

Answer 2

Answer:

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