It is given that u r = r x r! for r = 1, 2, 3, ....

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It is given that ur = r x r! for r = 1, 2, 3, .... Let Sn = u1 + u2 + u3 + … + un. Write down the values of 2! – S1, 3! - S2, 4! - S3, 5! - S4.

Conjecture a formula for Sn.

Prove, by mathematical induction, a formula for Sn, for all positive integers n.

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