Question

If an A. P. consists of n terms with first term a and nth term l show that the sum of the nthterm from the beginning and the mth term from the end is (a + l).​

Answer 1

Step-by-step explanation:

mth term from the beginning is t(m)

mth term from the end is t( n−m+1 ) th term from the beginning

t(m) + t(n-m+1)

= a+(m-1)d + a + (n-m)d

=a + md-d + a + nd-md

=a +{a+ nd-d}

=a + {a+(n-1)d}

=a + l

Answer 2

Answer:

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