Question

HOW MANY TERMS OF THE AP.
24,20,16.... MUST BE TAKEN
SO THAT THE SUM 60?​

Answer 1

Answer:

The first 3 terms

Step-by-step explanation:

Sum of 24 + 20 + 16 = 60

Answer 2

Answer:

3 And 10

Step-by-step explanation:

a=24

d= -4

Sn=60

Sn=n/2 (2a+(n-1)d)

60=n/2 (48-4n+4)

60=n/2 (52-4n)

60=n (26-2n)

60=26n-2n^2

2n^2-26n+60=0

n^2-13n+30=0

n^2-10n-3n+30=0

n (n-10)-3 (n-10)=0

n=3,n=10

when n=3

Sn=3/2 (48+2(-4))

Sn=3/2×40

Sn=60

when n=10

Sn=10/2 (48+9 (-4))

Sn=5 (48-36)

Sn=60