Find the sum of first 100 terms of ap( 1-2-3)+(2-3-4)+(3-4-5)...
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1-2-3 = -4
2-3-4 = -5
3-4-5 = -6
So the AP is -4, -5, -6, .....
a = -4
d = -1
So sum of 100 terms = 100/2{2x-4 + 99x-1}
=100/2 x -107
=-10700/2
= -5350
2-3-4 = -5
3-4-5 = -6
So the AP is -4, -5, -6, .....
a = -4
d = -1
So sum of 100 terms = 100/2{2x-4 + 99x-1}
=100/2 x -107
=-10700/2
= -5350
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