DETAILS, FICTION AND ซิกม่า 168

ตัวอย่างการใช้ซัมเมชั่นในโจทย์ทั่วไป“We predict that 168 Several hours will fly off the cabinets and into the palms of anybody who has ever uttered the phrases: ‘I’m SO active!’ or ‘If only I'd much more time!’ Vanderkam’s approach is amazingly strong and resonant