Question

Find the sum of all even numbers from 31 to 59

Answer 1

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The sum of all even numbers between 21 and 51

i.e. 22+24+26+28+....+50

first term is 22

last term is 50

common difference is 2

number of terms = (50-22/2) + 1 = 15

∴ Sum of the terms is =

15/2 (22+50)=15×(11+25)=15×36=540.

Answer 2

Answer:

The sum of all even numbers between 21 and 51

i.e. 22+24+26+28+....+50

first term is 22

last term is 50

common difference is 2

number of terms = (50-22/2) + 1 = 15

∴ Sum of the terms is =

15/2 (22+50)=15×(11+25)=15×36=540.

Explanation:

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