Which tern of AP 21,18,15.........is 82
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Given :- a= 21 , d= 18-21 = -3 and Tn = 82.
To find number of term :- ?
Tn = 82
a+(n-1)d = 82
21 + (n-1) (-3) = 82
n-1 = (82-21) / (-3)
n-1 = 61/(-3)
n = - 58/3.
To find number of term :- ?
Tn = 82
a+(n-1)d = 82
21 + (n-1) (-3) = 82
n-1 = (82-21) / (-3)
n-1 = 61/(-3)
n = - 58/3.
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