1.

the first and last term of an ap are a and l respectively show that the sum of the n^th term from the beginning and n^th term from the end is (a + l). i mark as brainlist who solve it with full sollution

Answer»

Let the FIRST term of the AP be a
and the COMMON difference be d

Thus the n^th term of the AP is An= l = a + (n-1)d
The n^th term from the BEGGINING is 'l' and the n^th term from the end is 'a'.

The sum of two term is a+(n-1)d+a=l+a


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