Question

which formula is used to add the sum of no 1 to 50 and even no between 1 to 50 with odd no from 1 to 50

Answer 1

Answer:

Step-by-step explanation:

S= 1+3+5+……………49

a=1 , d=2

Nth term= a+(n-1)d

49 =1+(n-1)2

48 = 2n-2

n=25

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

S=(25/2)[2+48]

S=625

Sum of even:-

S= 2+4+6+………….50

a=2 ,d= 2

Nth term= 2+(n-1)2

50 =2+2n-2

n=25

S= (25/2)[4+48]=25*52/2=25*26=650