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in Arithmetic Progression by (44.3k points)
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यदि एक अनुक्रम का n वाँ पद, an = n2 – n + 1 है तो इसके प्रथम पाँच पद ज्ञात कीजिए।

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दिया है, 

an = n2 – n + 1

n = 1, 2, 3, 4, 5 रखने पर

a1 = 12 – 1 + 1 = 1

a2 = 22 – 2 + 1 = 4 – 2 + 1 = 3

a3 = 32 – 3 + 1 = 9 – 3 + 1 = 7

a4 = 42 – 4 + 1= 16 – 4 + 1 = 13

a5 = 52 – 5 + 1 = 25 – 5 + 1 = 21

अतः प्रथम पाँच पद 1, 3, 7, 13, 21

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