Question

1/15,1/12,1/10,........to 11 terms.​

Answer 1

Step-by-step explanation:

a=1/15

d=1/12-1/15

d=1/60

n=11

an=a+(n-1)×d

a11=1/15+(11-1)×1/60

a11=7/30

S=n/2(a+an)

S=11/2(1/15+a11)

S=11/2(1/15+7/30)

S=3/10

Answer 2

Step-by-step explanation:

• Here we have given a1 =1/15, a2=12, a3=1/10.
• Common difference d = a2-a1
• d= 1/12-1/15
• d =-1/60
• an =a+(n-1)d
• 11=1/15+(11-1)(-1/60)
• 11=1/15+(-1/6)
• 11=1/15-1/6
• 11=6-15/90
• 11=-9/90
• 11=-1/10

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