एक समांतर श्रेणी जिसका प्रथम पद 2 तथा अंतिम पद 29 है कुल पदों का योग 155 है समांतर श्रेणी का सार्व अंतर ज्ञात कीजिए
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sorry but hindi me write nahi kar sakunga
Explain:-
pratham pad(a)=2
antim pad(l)=29, kul padon ka yog(Sn)=155
formula= n/2 multiply into (a+l)=Sn
=n/2*(2+29)=155
=n/2*31=155
=n/2=155/31
=n=155/31*2
=n=5*2
=n=10
kul padon(n)=10
ab tn=a+(n-1)d
= t10=2+(10-1)d
= 29=2+9d(ham t10 ke jage antim pad dal sakte he, kyu ki agar es me hamara n=10 aya he,eska matlab he kul das number ki yogphal he 155(2 se lekar 29 tak))
=29-2=9d
=27=9d
=d=27/9
=d=3(sadharan antar)
dekh try karte he 10 padon ko milakar
2+5+8+11+14+17+20+23+26+29
= 155
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