1.

The 21term of an AP ,whose first two terms are 3and -3 is​

Answer»

Step-by-step explanation:

a=3 ,a1=-3 so diffrence=6

n=21

we KNOW that

TN= a+(n-1)d

t21=3+(21-1)6

t21= 123

so 21th TERM is 123



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