Question

Sum of 5+25+125+...to the 10 term

Answer 1

Answer:

sum of 10 term is 950

Step-by-step explanation:

S10=?

a=5 , d=25-5=20 , n=10

S10=10/2 {2(5)+(10-1)20}   ____________________ (∵Sn=n/2 {2a+(n-1)} )

    = 5{10+(9)20}

    = 5{10+180}

    = 5{190}

    = 5×190

    = 950