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Question
Which term of the A.P. 18, 16, 14.... is -20?
Which term of the A.P. 18, 16, 14.... is -20?
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Solution
The correct option is C 20
Let the required term =nThe general form of A.P., an=a+(n−1)d
Common difference d=−2an=−20
an=a+(n−1)d
−20=18+(n−1)×−2
−20−18=−2n+2
−38−2=−2n
−40=−2n
n=20
Let the required term =n
The general form of A.P., an=a+(n−1)d
Common difference d=−2
Common difference d=−2
an=−20
an=a+(n−1)d
−20=18+(n−1)×−2
−20−18=−2n+2
−38−2=−2n
−40=−2n
n=20
an=a+(n−1)d
−20=18+(n−1)×−2
−20−18=−2n+2
−38−2=−2n
−40=−2n
n=20
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