Question

A) find the sum of all terms of the sequence 2,4,6.......... 80
B) find sum of all terms of the sequence 1,2,3.......49​

Answer 1

Answer:

A)Let the no of terms be n

2+(n-1)2=80

(n-1)2=78

n-1=39

n=40

Sum=40/2(2+80)

=20(82)=1640

B)Let the number of terms be 'n'.

1+(n-1)1=49

(n-1)=48

n=49

Sum=49/2(1+49)

=49/2×50=1225.

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