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In the given series,

a=-1,d=-5/6-(-1)=-5/6+1=(-5+6)/6=1/6,l=10/3

l=a+(n-1)d

10/3=(-1)+(n-1)1/6

10/3=-1+n/6-1/6

10/3=(-6+n-1)/6

10/3=(n-7)/6

(10/3)*6=(n-7)

10*2=n-7

20=n-7

n=20+7

**n=27**...

Therefore,**the number of terms in the given series is 27**.

a=-1,d=-5/6-(-1)=-5/6+1=(-5+6)/6=1/6,l=10/3

l=a+(n-1)d

10/3=(-1)+(n-1)1/6

10/3=-1+n/6-1/6

10/3=(-6+n-1)/6

10/3=(n-7)/6

(10/3)*6=(n-7)

10*2=n-7

20=n-7

n=20+7

Therefore,