11 n = 1. 21
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Step-by-step explanation:
Step-by-step explanation:
a=1, d=21/11-1=21-11/11=10/11. an=171/11.
an = a + (n - 1) \times dan=a+(n−1)×d
171/11=1+(n-1)10/11
171/11=11+(n-1)10/11
171(11)/11=11+(n-1)10
171-11=(n-1)10
160/10=n-1
16+1=17=n.
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