book Maths Puzzle Numerical Ability

Find the nth term of the arithmetic sequence,
a(1 symbol)=8, d=3,n=16

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book Other Question

15sqrt9 - sqrt9 What is the sum of the 1st 500 counting digits? That is what is the sum of 1+2+3+4+...+499+500? How about the sum of only the odd digits, 1+3+5+...+497+499?