Question

find the sum 5+8+11+.... +62​

Answer 1

Answer:

This is an Arithmetic Progression.

Sum = $\huge{\frac{20}{2}}$ × (10 + (19×3))

        = 670

Answer 2

Step-by-step explanation:

a+(n-1)d =62

5+(n-1)3=62

n-1=19

n=20

n/2(2a+(n-1)d)

20/2(10+19 x 3)

10(57+10)

670 Ans