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For all `alpha_i^t s, (i=1,2,3............20)` lying between `0^@` and `90^@`, it is given that `cos alpha_1+ cos alpha_2+ cos alpha_3...........cos alpha_20= 20`. What is the value (in degrees) of `(alpha_1+ alpha_2+ alpha_3 .......alpha_20)` ?
`0^@` से `90^@` के बीच स्थित सभी `alpha_i^t s, (i=1,2,3............20)` के लिए, यह दिया गया है कि `cos alpha_1+ cos alpha_2+ cos alpha_3...........cos alpha_20= 20` है | `(alpha_1+ alpha_2+ alpha_3 .......alpha_20)` का मान (डिग्री में) ज्ञात करें |

A

`900^@`

B

`1800^@`

C

`0^@`

D

`20^@`

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