Question

the sum of fst 25 terms in the sequence 1 +2+3+.... is​

Answer 1

Answer:

First term (a) = 1

Common deference (d) = 1

Number of terms (n) = 25

S = n/2(2a+(n-1)d)

S = 25/2(2*1+(25-1)1)

S = 25/2(2+24)

S = 25/2(26)

S = 25*13

S = 325