Which of the following is the 20th the series 2,5,8,11....?
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This is an AP
Use the equation for nth term
Use the equation for nth term
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a = 2, d = a2-a1 = 5-2 = 3
An = a+(n-1)d
A20 = 2+(20-1)3
= 2+19×3
= 57+2 = 59 is the 20th term.
An = a+(n-1)d
A20 = 2+(20-1)3
= 2+19×3
= 57+2 = 59 is the 20th term.
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