1²+1=2,2²+2=6,3³+3=12...is a sequence
a) is 30 a term of the sequence? if so what is its position?
b) is 99 a term of the sequence? how can we realize it ?
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Answer:
a) 30 is term in sequence. It's position is fifth
5²+5= 30
b) 99 is not the term in sequence because
on 9th position we have 9²+9=90 and tenth position there is 10²+10= 110
So 99 is not in sequence
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