Quantitative Aptitude – Sequence and series


Slot – 2 – Quantitative Aptitude – Sequence and series – If (2n+1)+(2n+3)+(2n+5)

Q. Sequence and series – If (2n+1)+(2n+3)+(2n+5)+…+(2n+47)=5280, then what is value of 1+2+3+…+n?

Answer: 4851

Solution: On solving, we get
48n + 576 = 5280
N = 98
Hence, n(n+1)/2 = 98*99/2 = 4851

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