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Determine the number of terms in …

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Determine the number of terms in the A.P. 3,7,11.,......,399.Also find its 20th term from the end. How to solve this question?
  • 1 answers

Jayanti Gupta 8 years, 1 month ago

For from end a=399 d=-4 For 20th term = 399 + (20-1)-4 = 399-76 = 323 20th term is 323
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