Question

find 'n' if the nth term of the following A.P is 64 : 1,4,7,10​

Answer 1

an= 64

a=1

d=4-1=3

an=a+[n-1]d

64=1+n-1×3

64-1=n-1×3

63÷3=n-1

21=n-1

n=21+1=22

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