सही विकल्प है (B) 75
समांतर श्रेढ़ी \(3,8,13,18, \ldots\)
प्रथम पद \((a)=3\)
सार्व अंतर \((d)=8-3=5\)
अब,
\(a_n =a+(n-1) d\)
\(\therefore a_{25} =3+(25-1) \times 5 \)
\(=3+(24) \times 5\)
\( =3+120\)
\(=123\)
\(\therefore a_{10} =3+(10-1) \times 5\)
\(=3+(9) \times 5\)
\(=3+45\)
\(=48\)
\(\therefore a_{25}-a_{10} =123-48\)
\(=75\)