Question

what is the sum of first 20 odd natural numbers​

Answer 1

HEY MATE

HERE IS YOUR ANSWER

1, 3 ,5,........tn

given - a = 1 , d = 2, n = 20

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

S20 =20 / 2 ( 2× 1 + ( 20 -1 ) 2)

= 10 ( 2 + 19 ×2)

= 10 ( 2 + 38)

= 10 × 40

= 400

HOPE IT HELPS

HAVE A NICE DAY AHED

Answer 2

some of the odd number is equal = n^2

sototal odd nos r 10

so10^2 =100

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