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⭐Given:
- a= -3
- d= 7
⭐To Find:
- 21 st term (t21) =?
⭐Solution:
tn=a+(n-1) d..... (formula)
: . t21= -3+(21-1) 7
: . t21=-3+20×7
: . t21=-3+140
: . t21=137
Therefore,
21 st term of an A. P is 137.
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