find the sum: 34+32+30+.....+10
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Answered by
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Step-by-step explanation:
34+32+30+.....+10+9+8+......+1 - 9-8-7.......-1
we know :
sum of 1,2,3,4.............n-1,n = n(n+1)/2
{(34)(35)/2} - {(9)(10)/2}
= 17*35 - 45
= 5(17*7-9)
= 5(110)
= 550
Answered by
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