Question

the sum of how many term of the A.P 14,12,10,.... will be zero​

Answer 1

Answer:

Ans is 15 terms

Step-by-step explanation:

a= 14

d= -2

Sn= 0

thus,. Sn=n/2*(2a+(n-1)*d)

0=n/2*{2(14)+(n-1)*-2}

0=n/2*{28-2n+2}

0=n/2*{30-2n}

0*2=n(30-2n)

0=30n-2n²

2n²-30n+0=0

2n*n=30n

2n=30n/n

n=30/2

n=15

Ans is 15