Question Find the sum 69 Evaluate n=1∑6(3n+1)Calculate n=1∑63n+n=1∑61Calculate More Steps Evaluate n=1∑63nCalculate 3×n=1∑6nSubstitute 6 for n into formula i=1∑ni=2n(n+1) 3×26(6+1)Add the numbers 3×26×7Reduce the fraction More Steps Evaluate 26×7Multiply the numbers 242Reduce the fraction 21 3×21Multiply the numbers 63 63+n=1∑61Calculate More Steps Evaluate n=1∑61Calculate (6−1+1)×1Calculate 6 63+6Solution 69 Show Solution
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