Question

If r = 10, an = 100, a = 1 then ‘n’ should be equal to ?

Answer 1

Answer:

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Step-by-step explanation:

an=nn!=((n+1)−1)n!=(n+1)!−n!a1=2!−1!a2=3!−2!a3=4!−3!a100=101!−100!

Adding all, we get

i=1∑100an=101!−1

Answer 2

Answer:

an=100

n= 100 is the answer