Find the 20th term from the last term of the AP :3,8,13, . . . , 253.
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Step-by-step explanation:
In a Given A.P ;
a = 3
d = 7-3 = 4
On the contrary let 144 be the nth term of A.P
Tn = 144
n = ?
Tn = a+(n-1)d
144 = 3+(n-1)4
n-1 = 141/4
n = 35.25+1
n = 36.25
As the value of n is a decimal or number, hence 144 is not the term of given A.P
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