CBSE Class 10 Answered
Arithmetic Progressions
Asked by | 13 Oct, 2009, 06:25: PM
Expert Answer
let a and d be the first term and common diff of the A.P.
so acc to qn,
a+md=2[a+nd]
so
a=(m-2n)d....(i)
LHS
=a+3md
=md-2nd+3md=4md-2nd=2[(2m-n)d]
RHS
=2[a+(m+n)d]
=2[md-2nd+md+nd]
=2[2md-nd]
so
lhs=rhs
=2[2md-nd
Answered by | 14 Oct, 2009, 09:07: AM
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