Question

a=8, 162 और S =210 दिया है। n और d ज्ञात कीजिए
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Answer 1

a=8 , a_n =62 " " S_n =210 rArr " " (n)/(2) (a_+a_n) =210 rArr " " (n)/(2) (8+62)=210 rArr " " n = (210xx2)/(70 ) =6तथातथा " " a_n =62 rArr " " a+ (n-1) d=62 rArr " " 8+ (6-1) d=62 " " rArr " " 5d =62 -8 =54 rArr " " d

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