Question

HOW MANY TERM OF AP 39, 33, 27
MUST BE ADDED TO CET 144​

Answer 1

Step-by-step explanation:

a=39

d=-6

Sn=n/2[2a+(n-1) d]

144=n/2(78-6n+6)

288=n(64-6n)

288=64n-384n^2

Now u can find the value of n

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