Suggested: find the sum of n terms of the series (4-1/n)+(4-2/n)+(4-3/n)+ - sin(n+1x sin(n+2)cos(n+1)x cos(x+2)x=cos x - what is the 20th term of the sequence defined by an=(n-1)(2-n)(3+n) - 1/n(n+1)(n+2) sum - sn=n(n+1)/2 - sn=n/2(2a+(n-1)d) - prove sn=n/2(2a+(n-1)d) - sn=n/2(2a+(n-1)d) proof - sn=n/2(2a+(n-1)d) example - sn=n(n+1) 2 Browse related:
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