#915511

#915511: If in an A.P., first term is 20 and 12th term is 120. Find the sum up to 12th term.

If in an A.P., first term is 20 and 12th term is 120. Find the sum up to 12th term.
Варианты ответа:
  • 420
  • 840
  • 40
  • 680
Тематика: Математика пробник Математический анализ Теория нечетких множеств
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