3. If the first term and last terms of an A.P (a, a) are gigiven and t

1.	3. If the first term and last terms of an A.P (a, a) are gigiven and theon difference is not given, then sum of n terms of A.FP.
Answer» Sum of n terms = n/2 × [a(1) + a(n) ] please give solution S(n) =Sum of n terms = n/2×( 2a + (n-1)d ) Now we simply this, We know a(n) = a + ( n - 1) d ......(1) So, S(n) = n/2×( a + a + (n-1)d ) S(n) = n/2×( a + a(n) ) ..... Using (1) a is first term. Proved. Please like my answer if you find it helpful

3. If the first term and last terms of an A.P (a, a) are gigiven and theon difference is not given, then sum of n terms of A.FP.

Answer»

Sum of n terms = n/2 × [a(1) + a(n) ]

please give solution

S(n) =Sum of n terms = n/2×( 2a + (n-1)d )

Now we simply this,

We know a(n) = a + ( n - 1) d ......(1)

So, S(n) = n/2×( a + a + (n-1)d )

S(n) = n/2×( a + a(n) ) ..... Using (1)

a is first term.

Proved.

Please like my answer if you find it helpful