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![⑶で、第15項と第40項を求めて[1]の公式を使うのはできませんか？
2枚目どこまちがって... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1807803/thumb_l_webp_17829043939990.webp?Expires=1787075136&Signature=bA4sL7HVIa0baa4C2vHwF6XCY~yeggrnpOhnmPedc0r4~cyTvTQR2ZsjTc4Yen83ooAaybJtBf9WGnQHadf~41pavWCBDTe69TwzhE0~XF0NdHHi1h-MOD1DPkTkrENoHzxM5N843p6-A1dcojK-WE9Y41-Bju-UEoJAoRiina8gS6Ohg0QQBhpJ9VOnBEscrcpITykwUc9j8wn99x7x2HCz2ppr~lDpN4bNMn8eXqEps87LqZXvjPoihyHib3HcqN4Ph8tFlrcuj1g4GytqqS6X1aynuLTIxF1lKwDaCpPCGEoQwhDX1-xtvF6S2Cc4gUAf8z46iz1~1QQhexEYEw__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787075136&Signature=VFF0ghi916g3rUzGjAD4SwtaVOsocQXwxQPPhOnEq0CiWZTOhdjK~kTL6qou~n2pNltyPngtdy~TPb1DNNwGqVW7Do2kb9ENXq8GBBUke3eD7OWOZizCMyN9XZyfGeg5Bu8-oyF28nwekW26HWJnoeqvRQ4PhAk3gN2JmmtzgsrADg-9~42f-AYZRWmiwGMncLV7wweR0xrN8fYIgYEQkUcv54TiZWi3dwb9SkzDygvxq5e~qPlPZxFKBs67LAXx4dYON~6ctyebqUAWRMAwO9U6IQVD~2fczCU-PW3WlKdQT7s01FgXnXJqJn9MnUdEAQEaFBihV3iNHl6qCPTnhw__&Key-Pair-Id=K2W722D70GJS8W)
![⑶で、第15項と第40項を求めて[1]の公式を使うのはできませんか？
2枚目どこまちがって... - 2](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1807804/thumb_l_webp_17829043940640.webp?Expires=1787075136&Signature=CC-dWd0o52Ex5d1b13kJDOuqDreqXNVFP4J-SiRhwKvHKP8rqz6H5Z9h2c92HFXfmT4bqx5Lo4uXuxHOSZF1dUa7HnOvbpq-SjNJx38GskfR72DKx0gy3XbiuOUFcmgpyfuqWAu5ZolX1-1ouEuwJMOVOR--WexskbwUFi-LG9-11nmv9YjTVFPIkJ96QMl8DH8xOi7vMemNQ~VpgoiYQFwyEuOzNeKdvCvxWVcdZh-TSWTSFGxL96nq0LEDmcM9Fg8uaGYPpUUIu-XI~IATCRKOfGGsUAoBBBtpwSomvCdhPqE10VjxGo8WcLO3RH9GHo3mvvl7wXtys~h1qyiIuA__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787075136&Signature=ZRUGn2xvMzG7GQiw482xP1NnX6-ezDrTA7PS5mObwtcJfle553aaZ0v0oVqbHyPAlqTMAPMY9TqTVvdsko4pZDwDBNcB6lsEBbUshaEZ8rild9ZuS9qdSgyAsthU8wlcyverAJxNJt9YVLqMz9WegctnD00WBtSwPx8-1lywJIjcvxIqfVJnLDr0twPwFHGwjplop6khFqZ6h9pTXulsVGfXP-yiegbm8TBV5yAw7pUoJYnsfGE4YR1WAuw6cxCeRWbU1i9BUxEhpWYP1aXMTq5Rga9omvvwnaifks8tzLclKfohYWC6qSxXt7lagnhnazYchDN3587kLZJOT7lK9A__&Key-Pair-Id=K2W722D70GJS8W)
ありがとうございます！