Question

Find the sum of first 20 teams the sequence 4,7,10..

Answer 1

Answer:

650

Step-by-step explanation:

sum of n terms = n/2(2a +{n-1}d)

n=20, a=4, d=3,

.'.replacing the values in the formula

=20/2(2*4+{20-1}3)

=10(8+57)

=10*65

=650

Answer 2

Answer:

650

Step-by-step explanation:

This seems to be an AP with a common difference of 3 terms

sum of AP = (First term+ Last term)* number of terms/2

Last term= first term + (number of terms-1)* common difference

4+(20-1)3

= 61

Sum of 20 terms = (4+61)*20/2

=650