Question

Find the sum of AP 34,32,30......20

Answer 1

AP : 34 + 32 + 30......+10

First term (a): 34  

Last term (l): 10  

l = a + (n-1)d

10 = 34 + (n-1) (-2)

Total no. Of terms n = 13

Sum = n(a+l)/2

=13(34+10)/2

=286

Answer 2

see attachment

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