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in Arithmetic Progression by (44.4k points)
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एक समान्तर श्रेणी का पहला पद 6 है तथा सार्वअन्तर – 3 है तब इसका 16 वाँ पद ज्ञात कीजिए।

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हम जानते हैं कि 

an = a + (n – 1)d

अतः a16 = a + (16 – 1)d

a16 = 6 + 15 × – 3 (यहाँ a = 6, d = – 3,)

a16 = 6 – 45

= – 39

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