First term and comman difference of an A.P. is -7 and 53 respectively. If the sum of all terms is 483 then how many terms are in the A.P ?
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a=-7
d=53
Sn=483
n=?
Sn=n/2[2a+(n-1)d]
483=n/2[2(-7)+(n-1)53]
483×2=n[-14+53n-53]
966=53n^2-67n
53n^2-67n-966=0
SOLVE THIS EQUATION YOU CAN GET YOUR ANSWER.
d=53
Sn=483
n=?
Sn=n/2[2a+(n-1)d]
483=n/2[2(-7)+(n-1)53]
483×2=n[-14+53n-53]
966=53n^2-67n
53n^2-67n-966=0
SOLVE THIS EQUATION YOU CAN GET YOUR ANSWER.
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