how to find n and d when a =22 and tn = -11 and Sn=66
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=a=22
=tn=-11
=Sn=66
=n/2(a+l)=66
=n/2(22-11)=66
=n/2×11=66
=n=(66×2)/11
=n=12 answer
=tn=-11
=a+(n-1)d=-11
=22+(12-1)d=-11
=22+11d=-11
=11d=-11-22
=11d=-33
=d=-33/11
=d=-3 answer
=tn=-11
=Sn=66
=n/2(a+l)=66
=n/2(22-11)=66
=n/2×11=66
=n=(66×2)/11
=n=12 answer
=tn=-11
=a+(n-1)d=-11
=22+(12-1)d=-11
=22+11d=-11
=11d=-11-22
=11d=-33
=d=-33/11
=d=-3 answer
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