Maths Olympiad Exam Numerical Ability

sum of 20 terms of the series given by 3+7+11+......... is

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the last term is 79
sum of 20 terms is n/2(ft+lt)
10(82)
820 is the ansr
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ans is 820
3,7,11.....79=820
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Maths Olympiad Other Question

if the number of different cards of different colours thomas has are in AP. If he has cards of 7 different colours in order of VIBGYOR such that the third colour is for times the fist colour and the sixth colour is 17 then find the number of fifth colour cards sum of the series of the sequence given by 2,6,18,..... for first ten terms
(write in powers form)