Question

The sum of first 10 even whole number is

Answer 1

First ten even numbers are,

2,4,6,8,10,12,14,16,18,20

2+4+6+8+10+12+14+16+18+20

=110 ans..

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Answer 2

Answer:

AP : 0, 2, 4.......

a = 0       d = 2-0 = 2        n = 10     S₁₀ = ?

S₁₀ = 10/2 [ 2(0) + (10-1) 2 ]

     = 5 × ( 0 + 18 )

     = 5 × 18

S₁₀  = 90

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