Question

What is the 50th term of term of the series 1,3,6,10,15,21?​

Answer 1

$\large\bf\underline{\underline{Answer}}$

The series is like 1,1+2,1+2+3,1+2+3+4,.... so 50th term wil be 1+2+3+4+....50sum of n natural numbers =n*(n+1)/2

where n is 50

answer wil be 25*51=1275

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Answer 2

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