Question

Which term of the A.P.7,13,19,.....is 205?

Answer 1

an = a + (n-1)d

205 = 7 + ( n -1)6

198 = (n -1)6

n - 1 = 33

n = 34

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Answer 2

An=a+(n-1)d

a=7 , d=13-7=6

so, 205=7+(n-1)6
=> 205-7=6n-6
=>198+6=6n
=>204=6n
=>n=204/6
=>n=34 answer

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