(2)の解き方と答えををお願いします！ 数学Bの階差数列のところです。
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![基本例題の[2]についてです。ここの条件ですが、
a/3<=1<=4a/3とありますが4a... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810404/thumb_l_webp_70236300-B387-4A8D-A246-76C58E626EEE.webp?Expires=1787701611&Signature=O8TOzs0up0WiCjv7zYEcaEy6V2hi~yURPU1suGI2blMyop9S7e72i5fV-ExkP5IAw7rQCIVE6oQrEwFpEnkVsT50u~AkZbvWnjWlzBawY1gYvAAAz-07YR8blDoR~i5S6EhG4iu0Nmr97OtLg4zD7K6RpZGYOvlLkecdB06arnjXjCWFPm1wHPrcbzjq2L7JO7rNIskMfZq6CcwbXaoF4nWf3mTFc-if-J3xBfgNUxTtpVlTS6sByBmMpYIhy2PmViXmU3ZN45R-JsFRGi5oLg8bu7Xp2Wbi0YaMxxo1CYoh6kTQysuJZjMYTRDItnpdBD4pe~zVzOf-BK7SPRrfmg__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787701611&Signature=y-qFuwbil~fZex8f3l96z24Zr8u2pv-4n2lbUmSs1XHz1LdNyilgQLVJd7Uv9-NAKYa9~IpLqGmJwqH12Na2QneL-qIzVLbazhLoOFT7WdcnPe-50YONL52BE9lRvT8ppwqk0DP7cDkydg9cfyb7ejLxGLHqJ6dDaSTODRBFzxPTS2GH9frwB~RhafyuQT4EHcHBvyK-GKNMjKYM5-kyxBUP8P0UkJcAl7oiO4OOFMDxA6xDTqitcUEWLqUgwSGzxO~StMQ7SUv4dfpqO2C99RxDkfdCLiaOIG4iMEtJR1i2TOSngv4SvuorE04s24beB1rx8DFRmTq3PfFZAeK-ig__&Key-Pair-Id=K2W722D70GJS8W)
